feat: add aspects to VALUE model of datasets

[jywadhwani]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable)

[jywadhwani]

Tested this e2e by looking at the search response. With this change one can see the underlying metadata aspects being returned as part of search response, as shown below.

{
  "start": 0,
  "count": 10,
  "total": 3,
  "elements": [{
    "urn": "urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)",
    "ownership": {
      "owners": [{
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:jdoe"
      }, {
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:datahub"
      }],
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      }
    },
    "origin": "PROD",
    "name": "SampleHdfsDataset",
    "institutionalMemory": {
      "elements": [{
        "createStamp": {
          "actor": "urn:li:corpuser:jdoe",
          "time": 1581407189000
        },
        "description": "Sample doc",
        "url": "https://www.linkedin.com"
      }]
    },
    "upstreamLineage": {
      "upstreams": [{
        "type": "TRANSFORMED",
        "auditStamp": {
          "actor": "urn:li:corpuser:jdoe",
          "time": 1581407189000
        },
        "dataset": "urn:li:dataset:(urn:li:dataPlatform:kafka,SampleKafkaDataset,PROD)"
      }]
    },
    "schemaMetadata": {
      "platformSchema": {
        "com.linkedin.schema.KafkaSchema": {
          "documentSchema": "{\"type\":\"record\",\"name\":\"SampleHdfsSchema\",\"namespace\":\"com.linkedin.dataset\",\"doc\":\"Sample HDFS dataset\",\"fields\":[{\"name\":\"field_foo\",\"type\":[\"string\"]},{\"name\":\"field_bar\",\"type\":[\"boolean\"]}]}"
        }
      },
      "created": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "fields": [{
        "fieldPath": "field_foo",
        "description": "Foo field description",
        "type": {
          "type": {
            "com.linkedin.schema.StringType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "string"
      }, {
        "fieldPath": "field_bar",
        "description": "Bar field description",
        "type": {
          "type": {
            "com.linkedin.schema.BooleanType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "boolean"
      }],
      "schemaName": "SampleHdfsSchema",
      "version": 0,
      "platform": "urn:li:dataPlatform:hdfs",
      "hash": ""
    },
    "platform": "urn:li:dataPlatform:hdfs"
  }, {
    "urn": "urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)",
    "ownership": {
      "owners": [{
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:jdoe"
      }, {
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:datahub"
      }],
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      }
    },
    "origin": "PROD",
    "name": "SampleHiveDataset",
    "institutionalMemory": {
      "elements": [{
        "createStamp": {
          "actor": "urn:li:corpuser:jdoe",
          "time": 1581407189000
        },
        "description": "Sample doc",
        "url": "https://www.linkedin.com"
      }]
    },
    "upstreamLineage": {
      "upstreams": [{
        "type": "TRANSFORMED",
        "auditStamp": {
          "actor": "urn:li:corpuser:jdoe",
          "time": 1581407189000
        },
        "dataset": "urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)"
      }]
    },
    "schemaMetadata": {
      "platformSchema": {
        "com.linkedin.schema.KafkaSchema": {
          "documentSchema": "{\"type\":\"record\",\"name\":\"SampleHiveSchema\",\"namespace\":\"com.linkedin.dataset\",\"doc\":\"Sample Hive dataset\",\"fields\":[{\"name\":\"field_foo\",\"type\":[\"string\"]},{\"name\":\"field_bar\",\"type\":[\"boolean\"]}]}"
        }
      },
      "created": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "fields": [{
        "fieldPath": "field_foo",
        "description": "Foo field description",
        "type": {
          "type": {
            "com.linkedin.schema.StringType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "string"
      }, {
        "fieldPath": "field_bar",
        "description": "Bar field description",
        "type": {
          "type": {
            "com.linkedin.schema.BooleanType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "boolean"
      }],
      "schemaName": "SampleHiveSchema",
      "version": 0,
      "platform": "urn:li:dataPlatform:hive",
      "hash": ""
    },
    "platform": "urn:li:dataPlatform:hive"
  }, {
    "urn": "urn:li:dataset:(urn:li:dataPlatform:kafka,SampleKafkaDataset,PROD)",
    "ownership": {
      "owners": [{
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:jdoe"
      }, {
        "type": "DATAOWNER",
        "owner": "urn:li:corpuser:datahub"
      }],
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      }
    },
    "origin": "PROD",
    "name": "SampleKafkaDataset",
    "institutionalMemory": {
      "elements": [{
        "createStamp": {
          "actor": "urn:li:corpuser:jdoe",
          "time": 1581407189000
        },
        "description": "Sample doc",
        "url": "https://www.linkedin.com"
      }]
    },
    "schemaMetadata": {
      "platformSchema": {
        "com.linkedin.schema.KafkaSchema": {
          "documentSchema": "{\"type\":\"record\",\"name\":\"SampleKafkaSchema\",\"namespace\":\"com.linkedin.dataset\",\"doc\":\"Sample Kafka dataset\",\"fields\":[{\"name\":\"field_foo\",\"type\":[\"string\"]},{\"name\":\"field_bar\",\"type\":[\"boolean\"]}]}"
        }
      },
      "created": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "lastModified": {
        "actor": "urn:li:corpuser:jdoe",
        "time": 1581407189000
      },
      "fields": [{
        "fieldPath": "field_foo",
        "description": "Foo field description",
        "type": {
          "type": {
            "com.linkedin.schema.StringType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "string"
      }, {
        "fieldPath": "field_bar",
        "description": "Bar field description",
        "type": {
          "type": {
            "com.linkedin.schema.BooleanType": {}
          }
        },
        "nullable": false,
        "recursive": false,
        "nativeDataType": "boolean"
      }],
      "schemaName": "SampleKafkaSchema",
      "version": 0,
      "platform": "urn:li:dataPlatform:kafka",
      "hash": ""
    },
    "platform": "urn:li:dataPlatform:kafka"
  }],
  "searchResultMetadatas": [{
    "name": "platform",
    "aggregations": {
      "hive": 1,
      "hdfs": 1,
      "kafka": 1
    }
  }, {
    "name": "origin",
    "aggregations": {
      "prod": 3
    }
  }]
}

[jywadhwani]

Tested the mid-tier change particularly DatasetUtil change by ingesting Status aspect with removed=true for a dataset and ensuring both search response and the response for api/v2/datasets/<urn> returns the correct removed field.

Ingestion
curl 'http://localhost:8080/datasets?action=ingest' -X POST -H 'X-RestLi-Protocol-Version:2.0.0' --data '{ "snapshot": { "aspects": [ { "com.linkedin.common.Status": { "removed": true } } ], "urn": "urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)" } }'

Response for request /api/v2/datasets/urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD) reflects the correct removed field
{"platform":"hdfs","nativeName":"SampleHdfsDataset","fabric":"PROD","uri":"urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)","description":"","nativeType":null,"properties":null,"tags":[],"removed":true,"deprecated":null,"deprecationNote":null,"decommissionTime":null,"createdTime":null,"modifiedTime":null,"customProperties":null}