Feature compatible sr bitmap

[AOKI123]

[core] Add the bitmap_agg aggregation function to be compatible with StarRocks' bitmap format.

Purpose

Linked issue: close #xxx

Tests

API and Format

Documentation

[JingsongLi]

Why we need to have a starrocks bitmap?

[AOKI123]

Why we need to have a starrocks bitmap?

@JingsongLi
Hi. When I use the bitmap data type of the Paimon table and query Paimon data with StarRocks, and use the StarRocks function bitmap_from_binary, an error occurs stating that it cannot be serialized into the Bitmap type of StarRocks. So I extended it to be compatible with the bitmap type of StarRocks, enabling me to use various bitmap functions on the Paimon table in StarRocks.

[JingsongLi]

@AOKI123 I suggest you use the custom jar to customize the merge function, and do not introduce SR dependencies in Paimon.