Rename aggregate functions to have _Agg suffix #296
Description
As suggested by @jiayuasu:
We should rename this to ST_Polygonize_Agg. Sedona, Snowflake, Databricks all use _agg to separate their Spatial SQL aggregate functions from scalar functions.
https://sedona.apache.org/latest/api/sql/AggregateFunction/
https://docs.snowflake.com/en/sql-reference/functions-geospatial
https://docs.databricks.com/aws/en/sql/language-manual/sql-ref-st-geospatial-functions
This is also true for DuckDB.
ST_Polygonize_Agg has been updated; however I believe ST_Collect(), ST_Intersection_Aggr() and ST_Union_Aggr() still need to be updated (Jia also notes in that thread that Sedona will update its _Aggr suffix to be Agg to match everybody else as well.