feat(graphql): support filtering based on greater than/less than criteria

[iprentic]

Example usage:

{
  searchAcrossEntities
(
    input: {types: [], query: "*", orFilters: 
[{and: [{field: "<numeric property>", condition: GREATER_THAN, values:["400"], negated: false}]}]}
) {
  searchResults {
    entity {
      urn,
      type
    }
  } 
  }
}

This PR is so short because the condition is parsed from GraphQL using Condition.valueOf:

datahub/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/resolvers/ResolverUtils.java

Line 177 in a8f0080

result.setCondition(Condition.valueOf(filter.getCondition().toString()));

And these already exist as conditions:

datahub/metadata-models/src/main/pegasus/com/linkedin/metadata/query/filter/Condition.pdl

Line 4 in a8f0080

* The matching condition in a filter criterion

So, simply add them as options in the GraphQL API to support filtering by them

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). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub