refactor(rust): Prefer ParquetError::oos to ParquetError::OutOfSpec

[SeanTater]

There are mixed uses of ParquetError::oos and ParquetError::OutOfSpec where it would just be clearer to pick one. So I favored the convenience constructor that saves a few keystrokes. I didn't make changes to the tests because that requires making pub fn oos(..) and I am not sure if people want that API to be exposed. If we made that change, there would be a few dozen more references cleaned up.

(This is my first commit to Polars - I'm doing some minor refactors to get my bearings so I can implement some improvements I need at work)

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.

Project coverage is 80.74%. Comparing base (59d2529) to head (9d73ef3).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...tes/polars-parquet/src/parquet/read/compression.rs	0.00%	4 Missing ⚠️
...es/polars-parquet/src/parquet/schema/types/spec.rs	0.00%	4 Missing ⚠️
crates/polars-parquet/src/parquet/compression.rs	0.00%	1 Missing ⚠️
...tes/polars-parquet/src/parquet/read/page/reader.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17314   +/-   ##
=======================================
  Coverage   80.73%   80.74%           
=======================================
  Files        1475     1475           
  Lines      193238   193235    -3     
  Branches     2760     2760           
=======================================
+ Hits       156013   156018    +5     
+ Misses      36715    36707    -8     
  Partials      510      510           

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[ritchie46]

Yeap, seems fine. 👍 Thanks.