drill

9173b0f8 - DRILL-7672: Make metadata type required when reading from / writing into Drill Metastore

DRILL-7672: Make metadata type required when reading from / writing into Drill Metastore 1. Upgraded Iceberg version and removed unneeded code for In / NotIn Expressions. 2. Updated Metastore Read / Modify interfaces to support required metadata types: a. introduced abstract Read / Modify classes with boilerplate code; b. added delete operation with filter and metadata type; c. added metadata type validator which checks supported metadata types for each component; d. made purge operation terminal; e. made necessary changes in REAME.md files. 3. Added / updated unit tests. closes #2042