refactor: Move scan parameter parsing for parquet to reusable function

[nameexhaustion]

Eventually should allow us to de-duplicate a lot of parameter parsing logic across scan types as well as supporting more parameters for them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.41%. Comparing base (e8ef72f) to head (0aba5c1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23019      +/-   ##
==========================================
+ Coverage   80.38%   80.41%   +0.02%     
==========================================
  Files        1682     1682              
  Lines      223374   223291      -83     
  Branches     2803     2802       -1     
==========================================
- Hits       179560   179551       -9     
+ Misses      43147    43077      -70     
+ Partials      667      663       -4     

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