[python] Add Python implementation of the PointCloudDataFrame class

[jp-dark]

Add the Python implementation of the new PointCloudDataFrame class.

Issue: #3046 #3108

[codecov]

Codecov Report

Attention: Patch coverage is 73.52025% with 85 lines in your changes missing coverage. Please review.

Project coverage is 88.27%. Comparing base (140bf0b) to head (4b83094).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3109      +/-   ##
==========================================
- Coverage   88.95%   88.27%   -0.69%     
==========================================
  Files          45       47       +2     
  Lines        4293     4589     +296     
==========================================
+ Hits         3819     4051     +232     
- Misses        474      538      +64     

Flag	Coverage Δ
python	88.27% <73.52%> (-0.69%)	⬇️

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Components	Coverage Δ
python_api	88.27% <73.52%> (-0.69%)	⬇️
libtiledbsoma	∅ <ø> (∅)