Rebased Parquet-based FileInputFormat impls to inherit from MapredParquetInputFormat, to make sure that Hive is appropriately recognizing those impls and applying corresponding optimizations.
- Converted HoodieRealtimeFileInputFormatBase and HoodieFileInputFormatBase into standalone implementations that could be instantiated as standalone objects (which could be used for delegation)
- Renamed HoodieFileInputFormatBase > HoodieCopyOnWriteTableInputFormat, HoodieRealtimeFileInputFormatBase > HoodieMergeOnReadTableInputFormat
- Scaffolded HoodieParquetFileInputFormatBase for all Parquet impls to inherit from
- Rebased Parquet impls onto HoodieParquetFileInputFormatBase
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