What changes were proposed in this pull request?

This patch introduces a metastore task as a MetastoreTaskThread that can expire snapshots of iceberg tables periodically according to configuration: catalog name, database pattern, table pattern. The configuration was inspired by the partition management task.

Patch contents:

1. IcebergHouseKeeperService + TestIcebergHouseKeeperService unit test
2. added the new task class (ICEBERG_TABLE_SNAPSHOT_EXPIRY_SERVICE_CLASS ) to the default housekeeping threads
3. MiniHS2 changes: withHouseKeepingThreads (for manual testing)
4. changing to keepJdbcUri=true in a call, otherwise in remote metastore mode, 2 different derby databases are used, leading to exotic problems
5. Generalized TableFetcher, which is a basically a table filter builder, originally in the PartitionManagementTask, completely reused + TestTableFetcher unit test

Why are the changes needed?

This service could act as a convenient helper to maintain iceberg tables, which otherwise need explicit hive ql statements by the user.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Unit tests added.

Manual testing is also possible, as the patch adds MiniHS2 capability and fixes to run metastore tasks in remote mode, example command:

mvn clean install -Dtest=StartMiniHS2Cluster -DminiHS2.clusterType=llap -DminiHS2.conf="target/testconf/llap/hive-site.xml"  -DminiHS2.run=true -DminiHS2.usePortsFromConf=true -pl itests/hive-unit -Pitests -pl itests/util -DminiHS2.clusterType=LOCALFS_ONLY -DminiHS2.isMetastoreRemote=true -DminiHS2.withHouseKeepingThreads=true