Resolve page pruning StatisticsConverter once per file instead of once per row group

[alamb]

Note: this PR is stacked on #24150 -- please review only the final commit until that merges.

Which issue does this PR close?

• N/A (small performance follow-on to Skip page index load (and ParquetMetaData clone) when the file has no page index #24150)

Rationale for this change

During page index pruning, prune_plan_with_page_index_and_metrics creates a StatisticsConverter for each predicate inside the per-row-group loop. Each construction calls parquet_column, which does a linear scan of both the Arrow schema fields and the Parquet leaf columns to resolve the predicate column, so the same column resolution is recomputed once per (predicate, row group).

For files with many row groups this adds up: the single-file ClickBench hits.parquet has 226 row groups and 105 columns, so a query with 2 pushed-down predicate columns resolved the same 2 columns 452 times per file open.

What changes are included in this PR?

• Hoist the (predicate, StatisticsConverter) construction out of the row-group loop so each predicate column is resolved once per file, and pass the converter down by reference (prune_pages_in_one_row_group and PagesPruningStatistics now borrow it).
• Minor side effect: predicates skipped because they are multi-column or fail converter creation are now logged once per file rather than once per row group.

Are these changes tested?

Covered by existing tests: datafusion-datasource-parquet lib tests and the page_pruning integration tests in datafusion/core/tests/parquet/ all pass. No behavior change intended.

Are there any user-facing changes?

No.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.96855% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.06%. Comparing base (7d31a09) to head (7f46ba2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
datafusion/datasource-parquet/src/page_filter.rs	77.41%	7 Missing ⚠️
datafusion/datasource-parquet/src/opener/mod.rs	99.21%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #24182    +/-   ##
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  Coverage   81.06%   81.06%            
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  Files        1106     1106            
  Lines      382252   382356   +104     
  Branches   382252   382356   +104     
========================================
+ Hits       309856   309960   +104     
+ Misses      54090    54088     -2     
- Partials    18306    18308     +2     

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