bench: multi-conjunct shared-prefix struct row-filter pushdown

[SubhamSinghal]

Which issue does this PR close?

• Follow-up to review feedback on Parquet row filter struct access tree #23217.

Rationale for this change

The row-filter planner in datafusion-datasource-parquet walks the accessed struct-field paths for every filter, resolves the Parquet leaves, and builds a pruned Arrow schema. When multiple predicates share a common struct prefix, the planner can consolidate that traversal work — this is the case the StructAccessTree refactor in #23217 is intended to accelerate.

The existing bench suite does not cover this shape:

• parquet_struct_query — single-field struct predicates only
  (WHERE s['id'] = 5).
• parquet_struct_projection — projection-only, no WHERE clause.

So multi-conjunct shared-prefix planning is currently uninstrumented, and the effect of consolidating access-path traversals is invisible against the existing suite.

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

No. Benchmark-only; no library or API surface is touched.

[kumarUjjawal]

Hi @SubhamSinghal I will take a look. Can you please resolve the conflict.

[SubhamSinghal]

resolved merge conflict

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.87%. Comparing base (62650ef) to head (939dad2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23524      +/-   ##
==========================================
- Coverage   80.87%   80.87%   -0.01%     
==========================================
  Files        1101     1101              
  Lines      375765   375765              
  Branches   375765   375765              
==========================================
- Hits       303915   303904      -11     
- Misses      53747    53754       +7     
- Partials    18103    18107       +4     

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