feat(rust!): Rename group_by_rolling to rolling and improve related error messages

[MarcoGorelli]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 80.91%. Comparing base (cb3efbc) to head (aa33500).
Report is 4 commits behind head on main.

❗ Current head aa33500 differs from pull request most recent head 4ccc202. Consider uploading reports for the commit 4ccc202 to get more accurate results

Files	Patch %	Lines
...s-time/src/chunkedarray/rolling_window/dispatch.rs	50.00%	1 Missing ⚠️
crates/polars-time/src/group_by/dynamic.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14765      +/-   ##
==========================================
- Coverage   81.24%   80.91%   -0.33%     
==========================================
  Files        1348     1324      -24     
  Lines      175347   171894    -3453     
  Branches     2518     2454      -64     
==========================================
- Hits       142464   139093    -3371     
+ Misses      32402    32333      -69     
+ Partials      481      468      -13     

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[ritchie46]

Yeap, agree. Want to wait a bit with merging as we then can still make patches to the newly released rust version.

[stinodego]

Thanks Marco!