perf: Pre-sort groups in group-by-dynamic

[ritchie46]

Same as #21403

[github-actions]

The uncompressed lib size after this PR is 41.6629 MB.

[codecov]

Codecov Report

Attention: Patch coverage is 99.09910% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.60%. Comparing base (5b6a7b7) to head (8d5449a).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...olars-mem-engine/src/executors/group_by_rolling.rs	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21569      +/-   ##
==========================================
+ Coverage   79.59%   79.60%   +0.01%     
==========================================
  Files        1591     1591              
  Lines      229520   229268     -252     
  Branches     2632     2632              
==========================================
- Hits       182680   182506     -174     
+ Misses      46233    46155      -78     
  Partials      607      607              

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