Fix Measurement Set Gridding

[tgross03]

• Downgraded the pinned version for numpy in pyproject.toml to avoid potential conflicts.

• Updated the docstring for the vis_data attribute in GridData to specify its shape for better clarity.

• Improved data selection and masking logic in GridData.from_ms to ensure correct row selection, flag masking, and shape alignment for measurement and channel data. This also fixes the handling of flagged data and ensures that the returned arrays are correctly filtered and shaped.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.64%. Comparing base (2506995) to head (f263eec).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/pyvisgrid/core/gridder.py	10.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   34.39%   35.64%   +1.24%     
==========================================
  Files           8        8              
  Lines         407      404       -3     
  Branches       70        0      -70     
==========================================
+ Hits          140      144       +4     
+ Misses        263      260       -3     
+ Partials        4        0       -4     

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