fix: Parquet delta encoding for 0-bitwidth miniblocks

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.20%. Comparing base (8d43ba1) to head (a7c18d5).
Report is 38 commits behind head on main.

Files	Patch %	Lines
...et/src/parquet/encoding/delta_bitpacked/decoder.rs	42.85%	4 Missing ⚠️
crates/polars-io/src/parquet/read/predicates.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18289      +/-   ##
==========================================
- Coverage   80.21%   80.20%   -0.02%     
==========================================
  Files        1501     1501              
  Lines      198925   198924       -1     
  Branches     2837     2837              
==========================================
- Hits       159576   159538      -38     
- Misses      38821    38858      +37     
  Partials      528      528              

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