[subtask] store and retrieve the Iceberg metrics in Iceberg REST service

[FANNG1]

What would you like to be improved?

now we just add a mock interface and drop the metrics. we need to store the metrics.

parent: #321

[FANNG1]

Iceberg metrics include commit metrics and scan metrics.

commit metrics:

{reportType=COMMIT_REPORT, report=CommitReport{tableName=rest.iceberg_rest_dml.test, snapshotId=7084087367671717860, sequenceNumber=0, operation=append, commitMetrics=CommitMetricsResult{totalDuration=TimerResult{timeUnit=NANOSECONDS, totalDuration=PT0.359504583S, count=1}, attempts=CounterResult{unit=COUNT, value=1}, addedDataFiles=CounterResult{unit=COUNT, value=1}, removedDataFiles=null, totalDataFiles=CounterResult{unit=COUNT, value=2}, addedDeleteFiles=null, addedEqualityDeleteFiles=null, addedPositionalDeleteFiles=null, removedDeleteFiles=null, removedEqualityDeleteFiles=null, removedPositionalDeleteFiles=null, totalDeleteFiles=CounterResult{unit=COUNT, value=0}, addedRecords=CounterResult{unit=COUNT, value=2}, removedRecords=null, totalRecords=CounterResult{unit=COUNT, value=4}, addedFilesSizeInBytes=CounterResult{unit=BYTES, value=662}, removedFilesSizeInBytes=null, totalFilesSizeInBytes=CounterResult{unit=BYTES, value=1324}, addedPositionalDeletes=null, removedPositionalDeletes=null, totalPositionalDeletes=CounterResult{unit=COUNT, value=0}, addedEqualityDeletes=null, removedEqualityDeletes=null, totalEqualityDeletes=CounterResult{unit=COUNT, value=0}}, metadata={engine-version=3.4.1, app-id=local-1698288445275, engine-name=spark, iceberg-version=Apache Iceberg 1.3.1 (commit 62c34711c3f22e520db65c51255512f6cfe622c4)}}}

Scan metrics:

{reportType=SCAN_REPORT, report=ScanReport{tableName=rest.iceberg_rest_dml.test, snapshotId=7084087367671717860, filter=true, schemaId=0, projectedFieldIds=[1, 2], projectedFieldNames=[id, data], scanMetrics=ScanMetricsResult{totalPlanningDuration=TimerResult{timeUnit=NANOSECONDS, totalDuration=PT0.145495083S, count=1}, resultDataFiles=CounterResult{unit=COUNT, value=2}, resultDeleteFiles=CounterResult{unit=COUNT, value=0}, totalDataManifests=CounterResult{unit=COUNT, value=2}, totalDeleteManifests=CounterResult{unit=COUNT, value=0}, scannedDataManifests=CounterResult{unit=COUNT, value=2}, skippedDataManifests=CounterResult{unit=COUNT, value=0}, totalFileSizeInBytes=CounterResult{unit=BYTES, value=1324}, totalDeleteFileSizeInBytes=CounterResult{unit=BYTES, value=0}, skippedDataFiles=CounterResult{unit=COUNT, value=0}, skippedDeleteFiles=CounterResult{unit=COUNT, value=0}, scannedDeleteManifests=CounterResult{unit=COUNT, value=0}, skippedDeleteManifests=CounterResult{unit=COUNT, value=0}, indexedDeleteFiles=CounterResult{unit=COUNT, value=0}, equalityDeleteFiles=CounterResult{unit=COUNT, value=0}, positionalDeleteFiles=CounterResult{unit=COUNT, value=0}}, metadata={engine-version=3.4.1, iceberg-version=Apache Iceberg 1.3.1 (commit 62c34711c3f22e520db65c51255512f6cfe622c4), app-id=local-1698288445275, engine-name=spark}}}

[FANNG1]

https://docs.google.com/document/d/1q4dpFybxR5Msa3TqFey4wEjvT06wEJTrkzyaMZy6Cnw/edit

[FANNG1]

@jerryshao , please move this to Gravitino 0.4, I'll try to fix the remaining issues.