Add support for PostGIS geometry type

[geoHeil]

When ingestion a PostGIS table with a column of type Geometry OpenMetadata emits a warning:

/source/database/sql_column_handler.py:174: SAWarning: Did not recognize type 'geometry' of column 'geom'
  columns = inspector.get_columns(table_name, schema_name, db_name=db_name)

Instead of using the correct type geometry the metadata of VarChar is stored

[geoHeil]

Ideally, you could parse the CRS attribute from it as well.

[NiharDoshi99]

Hello , I will work on this issue.