Batch Ingestion from Delta Table

Currently, Pinot cannot perform batch ingestion from a [delta](https://delta.io/) table. It would be an excellent feature since the project is open-sourced and has many users.

We can build a new [RecordReader](https://github.com/apache/pinot/blob/6903856d399b4d7b09548a75a888382e1659e9e3/pinot-plugins/pinot-input-format/pinot-parquet/src/main/java/org/apache/pinot/plugin/inputformat/parquet/ParquetNativeRecordReader.java#L44) interface for delta tables utilizing the [delta-standalone](https://docs.delta.io/latest/delta-standalone.html) library.