perf: Use vertical parallelism if input is chunked for Filter,Select,WithColumns

[ritchie46]

Readers often get chunked data. Now we decide to not rechunk on default. If we have elementwise operations we can now create tasks vertically (over chunks) and horizontally (over columns). This should saturate your thread much more if you do elementwise operations.

[codecov]

Codecov Report

Attention: Patch coverage is 99.36709% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.15%. Comparing base (5e74924) to head (bc04c8d).
Report is 4 commits behind head on main.

❗ Current head bc04c8d differs from pull request most recent head 065661a. Consider uploading reports for the commit 065661a to get more accurate results

Files	Patch %	Lines
crates/polars-plan/src/logical_plan/aexpr/utils.rs	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15608      +/-   ##
==========================================
- Coverage   81.16%   81.15%   -0.02%     
==========================================
  Files        1367     1371       +4     
  Lines      174992   175770     +778     
  Branches     2530     2531       +1     
==========================================
+ Hits       142031   142644     +613     
- Misses      32484    32648     +164     
- Partials      477      478       +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #15608 will not alter performance

_{Comparing vert (065661a) with main (0b84b14)}

Summary

✅ 22 untouched benchmarks