bench: add grouped aggregate filter benchmarks

[lyne7-sc]

Which issue does this PR close?

• Closes #.

Rationale for this change

Add a microbenchmark for measuring grouped aggregate FILTER performance across different filter selectivities and aggregate layouts.

What changes are included in this PR?

• Add an AggregateExec microbenchmark for grouped aggregates with FILTER.
• Cover one aggregate, two aggregates sharing a filter, and two aggregates using distinct filters.
• Cover bare-column and multiplication arguments for the single-aggregate layout.
• Cover unfiltered, 1%, 10%, 50%, 90%, 99%, and 100% filter selectivities.

Are these changes tested?

Yes.

Are there any user-facing changes?

No.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.47%. Comparing base (c56a7ab) to head (b88151a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24748      +/-   ##
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- Coverage   81.47%   81.47%   -0.01%     
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  Files        1122     1122              
  Lines      404140   404140              
  Branches   404140   404140              
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- Hits       329284   329275       -9     
- Misses      55546    55548       +2     
- Partials    19310    19317       +7     

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[2010YOUY01]

Thank you! Just some optional suggestions and follow-up ideas.

I don't known if we have SQL benchmarks for aggregate queries with filters, if not, we could also add some in: https://github.com/apache/datafusion/tree/main/benchmarks/sql_benchmarks/clickbench_extended

[2010YOUY01]

I think this is a key axis to vary, we could add a very small and a very high cardinality variant.