Read in parquet OMOP datasets

[stefpiatek]

Description

Fixes #231, allowing OMOP ES batched extract to be parsed by PIXL

Type of change

Please delete options accordingly to the description.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Suggested Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have commented my code, particularly in hard-to-understand areas.
• I have passed on my local host device. (see further details at the CONTRIBUTING document)
• Make sure your branch is up-to-date with main branch. See CONTRIBUTING for a general example to syncronise your branch with the main branch.
• I have requested review to this PR.
• I have addressed and marked as resolved all the review comments in my PR.
• Finally, I have selected squash and merge

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.89%. Comparing base (881acca) to head (b72940c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cli/src/pixl_cli/_io.py	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #616      +/-   ##
==========================================
+ Coverage   87.76%   87.89%   +0.12%     
==========================================
  Files          76       76              
  Lines        3581     3619      +38     
==========================================
+ Hits         3143     3181      +38     
  Misses        438      438              

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