Support iceberg v2 table

[caneGuy]

Enhancement

v2 format can support update for iceberg table related with #1030

We will use c++ to implement the merge on read logic

Phase 1: Key points

1. Only support Parquet and Orc
2. Schedule data file scan range together with related delete files, process them together on BE
3. Support position pushdown separately for Parquet and Orc
4. Only support position delete file

• [ ] Support get delete file information in Planner and send to BE
• [ ] Parquet: Support virtual column _POS for position delete file
• [ ] Parquet: Support position pushdown
• [ ] Orc: Support virtual column _POS for position delete file
• [ ] Orc: Support position pushdown
• [ ] Implement merge on read logic

Phase 2x:

• [ ] Support equality delete file
• [ ] Add Avro reader

[caneGuy]

cc @choury @DorianZheng @mxdzs0612 @stephen-shelby

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