bench(parquet): add benchmark for fully matched row group filter skip

Add a criterion benchmark that measures the performance improvement
from skipping RowFilter evaluation on row groups where statistics
prove all rows match the predicate.

Tests both push-decoder and async-reader paths with three scenarios:
- pushdown_no_skip: filter evaluated on every row group
- pushdown_with_skip: filter skipped for fully matched row groups
- no_pushdown: no filter at all (baseline)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: xudong963

parquet/Cargo.toml

@@ -275,6 +275,11 @@ name = "row_selection_cursor"
 harness = false
 required-features = ["arrow"]
 
+[[bench]]
+name = "arrow_reader_fully_matched"
+required-features = ["arrow", "async"]
+harness = false
+
 [[bench]]
 name = "bloom_filter"
 harness = false