Add equality-delete apply on PyArrow reads

[daviddallakyan2005]

Closes #3270

Rationale for this change

Index equality delete files and apply them on PyArrow scans so CDC and merge-on-read tables can be read. Equality deletes still cannot be written.

This ports the DeleteFileIndex work from #3285 onto current main, skips bounds prune when an equality field has been dropped, and left anti joins matching equality delete rows after positional deletes. It supersedes #3285, which is open and conflicting. Credit to Alex Stephen for the index. Please close #3285 if this path is preferred.

When a data file has equality deletes, the scan concatenates that file’s record batches, aligns each matching equality-delete table by field id then concats, adds is_null / fill_null (and is_nan for floats) helper columns per key, left anti joins once, then yields the survivors; files with only position deletes still yield each scanner batch.

Are these changes tested?

Yes.

make test
3962 passed, 3 skipped, 1570 deselected

make lint
All prek hooks Passed

make test PYTEST_ARGS="-v -k equality"
168 passed, 5367 deselected

uv run python -m pytest tests/table/test_delete_file_index.py tests/io/test_pyarrow.py tests/catalog/test_scan_planning_models.py tests/table/test_validate.py tests/table/test_init.py -m "(unmarked or parametrize) and not integration" -v
371 passed, 57 deselected

make test-integration PYTEST_ARGS="-v --tb=short"
1350 passed, 71 skipped, 3 failed, 4111 deselected

The three integration failures match main without this diff. test_read_spark_written_puffin_dv raises DeprecationWarning for puffin.to_vector(). Two DuckDB tests failed to download the iceberg extension.

Are there any user-facing changes?

Yes. Tables that already store equality deletes can be scanned.