Avoid DataFrame mutation

[JulesBlm]

Some functions like map_to_brgi_db mutate the DataFrame that is passed in. This causes an error when calling some function twice, for example:

from bedrock_ge.gi.mapper import map_to_brgi_db
from bedrock_ge.gi.ags import ags_to_brgi_db_mapping

brgi_mapping_1 = ags_to_brgi_db_mapping("file1.ags", projected_crs)

brgi_db_1 = map_to_brgi_db(brgi_mapping_1)
brgi_db_2 = map_to_brgi_db(brgi_mapping_1) # ValueError(f"cannot insert {column}, already exists") ValueError: cannot insert project_uid, already exists

Suggested Fix

We should avoid mutation by copying the passed in DataFrame, and optionally add an optional inplace parameter that is set to False by default.

[JulesBlm]

Closed by #71