Apply read_columns kwarg in parquet reader

[troyraen]

Change Description

Closes #296
Fixes a bug where ParquetReader.read takes a read_columns kwarg but doesn't actually use it.

• My PR includes a link to the issue that I am addressing

Solution Description

• Pass the read_columns kwarg through to the read. This allows the mapping step to read only necessary columns (ra/dec) rather than all of them.
• Add a column_names class property. This allows the user to import only a subset of columns.
• Add unit test test_parquet_reader_columns.

Code Quality

• I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

Project-Specific Pull Request Checklists

Bug Fix Checklist

• My fix includes a new test that breaks as a result of the bug (if possible)
• My change includes a breaking change
  • My change includes backwards compatibility and deprecation warnings (if possible)

New Feature Checklist

• I have added or updated the docstrings associated with my feature using the NumPy docstring format
• I have updated the tutorial to highlight my new feature (if appropriate)
• I have added unit/End-to-End (E2E) test cases to cover my new feature
• My change includes a breaking change
  • My change includes backwards compatibility and deprecation warnings (if possible)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.53%. Comparing base (06b8379) to head (d4acbfe).
Report is 51 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #315   +/-   ##
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  Coverage   99.53%   99.53%           
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  Files          25       25           
  Lines        1282     1284    +2     
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+ Hits         1276     1278    +2     
  Misses          6        6           

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