Geometry encoding parameter for shapes

[keller-mark]

Fixes #799
The to_parquet function supports a geometry_encoding parameter. When geoarrow, it will be more efficient to read/parse the geometries, as the data can stay in its parquet/arrow memory layout during downstream usage. Visualization applications will benefit from this (and other applications such as data processing pipelines should too).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.36%. Comparing base (18eb623) to head (5c0446e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #951   +/-   ##
=======================================
  Coverage   92.36%   92.36%           
=======================================
  Files          48       48           
  Lines        7416     7417    +1     
=======================================
+ Hits         6850     6851    +1     
  Misses        566      566           

Files with missing lines	Coverage Δ
src/spatialdata/_core/spatialdata.py	91.64% <100.00%> (ø)
src/spatialdata/_io/io_shapes.py	95.23% <100.00%> (+0.07%)	⬆️

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