perf: Batch nested Parquet decoding

[coastalwhite]

This PR is a follow up to #17462. This batches the collects in the nested Parquet decoders, with that we can also simplify the code quite a lot.

I did a benchmark where we had one column { 'x': pl.List(pl.Int8) } of length 10_000_000. Then, we read that Parquet file 50 times. Here are the results.

Benchmark 1: After Optimization
  Time (mean ± σ):      3.398 s ±  0.064 s    [User: 49.412 s, System: 4.362 s]
  Range (min … max):    3.311 s …  3.490 s    10 runs

Benchmark 2: Before Optimization
  Time (mean ± σ):      4.135 s ±  0.015 s    [User: 59.506 s, System: 5.234 s]
  Range (min … max):    4.105 s …  4.149 s    10 runs

Summary
  After Optimization ran
    1.22 ± 0.02 times faster than Before Optimization

The nested decoder is still relatively inefficient, but this is a step in the right direction.

[codecov]

Codecov Report

Attention: Patch coverage is 55.99022% with 180 lines in your changes missing coverage. Please review.

Project coverage is 80.49%. Comparing base (a5724d6) to head (6e096aa).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...arquet/src/arrow/read/deserialize/binary/nested.rs	0.00%	44 Missing ⚠️
...arrow/read/deserialize/fixed_size_binary/nested.rs	0.00%	42 Missing ⚠️
crates/polars-arrow/src/bitmap/utils/iterator.rs	63.33%	22 Missing ⚠️
...quet/src/parquet/encoding/hybrid_rle/translator.rs	13.04%	20 Missing ⚠️
...rquet/src/arrow/read/deserialize/binview/nested.rs	60.86%	18 Missing ⚠️
...arquet/src/arrow/read/deserialize/binview/basic.rs	18.18%	9 Missing ⚠️
...polars-parquet/src/arrow/read/deserialize/utils.rs	81.81%	6 Missing ⚠️
...parquet/src/arrow/read/deserialize/nested_utils.rs	83.33%	5 Missing ⚠️
...uet/src/arrow/read/deserialize/primitive/nested.rs	90.90%	4 Missing ⚠️
...quet/src/arrow/read/deserialize/binary/decoders.rs	40.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17542      +/-   ##
==========================================
+ Coverage   80.47%   80.49%   +0.02%     
==========================================
  Files        1482     1483       +1     
  Lines      195119   195171      +52     
  Branches     2778     2778              
==========================================
+ Hits       157026   157109      +83     
+ Misses      37582    37551      -31     
  Partials      511      511              

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