Round 2 of refactoring for ParquetTools

[malhotrashivam]

As part of PR #5358, we have done a significant refactoring of APIs in ParquetTools and marked a number of APIs as deprecated, which will be removed soon as part of issue #5362.

Once we have removed the deprecated APIs, we should do another round of refactoring with the following ideas:

• Right now ParquetInstructions is used for reading and writing. We should consider bifurcating into an ImmutableStyle ReadInstructions and WriteInstructions and move instructions like isRefreshing into read-only instructions, and index columns as write-only instructions, and so on.
• Right now, we have writeTable for writing a single table, writeTables for writing Table[] and writeKeyValuePartitionedTable for partitioned writing of Table or PartitionedTable. We can refactor them to only expose a writeTable. writeTables should be covered by accepting a PartitionedTableFactory.of(Table[]) and writing them out as a flat partitioned table. Partitioned writing should be indicated by providing a KV_PARTITIONED layout instead of a separate API.