support native map datatype

[xxchan]

• https://www.notion.so/risingwave-labs/Map-type-788a6cb277de46669052683493a5d170
• https://github.com/risingwavelabs/risingwave-docs/issues/2457

Internals

• feat: add map type to scalar/array/expr #17690
• perf(map): optimize MapRef to reduce more copy #17863

Peripherals

• disallow usage of jsonb/map type in group by / order by / primary key #7981
• feat: support parsing map type: map(k,v) #17860
• support more map functions
  • feat: support map_access #17986
  • feat: support more map functions #18073
  • cast jsonb/struct to map feat(expr): support jsonb_populate_map #18378
  • potential optimizations perf: vectorized execution for ListArray functions #17784
• source: support Avro / Protobuf
  • feat(source): support ingesting Avro map type to RisingWave map type #17980
  • connector: support protobuf map type in source #13387
• Sink
  • feat(sink): support sink map to avro #18551
  • feat(sink): support sink map to protobuf #18552
  • clickhouse sink, etc
• feat: support constructor MAP {..} and index operator m[k] for map #18066
• add from_arrow. to_arrow is already done, but from_arrow is forgotten. (can add an iceberg sink/source test) feat: support arrow map -> rw map #18375