perf: Parquet do not copy uncompressed pages

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.92%. Comparing base (a5b441a) to head (9ea473e).
Report is 44 commits behind head on main.

Files with missing lines	Patch %	Lines
...tes/polars-parquet/src/parquet/read/compression.rs	94.11%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18441      +/-   ##
==========================================
- Coverage   79.93%   79.92%   -0.01%     
==========================================
  Files        1496     1496              
  Lines      200190   200186       -4     
  Branches     2867     2867              
==========================================
- Hits       160029   160008      -21     
- Misses      39615    39632      +17     
  Partials      546      546              

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