Toniof xxx support kml

[TonioF]

Geodataframes can be read from and written to kml files

Checklist:

• Add unit tests and/or doctests in docstrings
• [ ] Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/source/*
• Changes documented in CHANGES.md
• GitHub CI passes
• AppVeyor CI passes
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

Attention: Patch coverage is 90.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 89.47%. Comparing base (cc15e46) to head (5e5deda).

Files with missing lines	Patch %	Lines
xcube/core/store/fs/impl/geodataframe.py	90.54%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1141      +/-   ##
==========================================
+ Coverage   89.34%   89.47%   +0.12%     
==========================================
  Files         279      279              
  Lines       21331    21404      +73     
==========================================
+ Hits        19059    19152      +93     
+ Misses       2272     2252      -20     

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