feat: Add `testing.assert_frame_equal` #13390

Job	Run time
pytest-39 (3.9, ubuntu-latest)	1m 1s
pytest-39 (3.9, windows-latest)	1m 38s
pytest-windows (3.12, windows-latest)	3m 46s
pytest-windows (3.10, windows-latest)	3m 38s
pytest-narrower-dependencies (3.13, ubuntu-latest)	1m 8s
pytest-full-coverage (3.11, ubuntu-latest)	4m 50s
pytest-full-coverage (3.13, ubuntu-latest)	5m 19s
python-314 (3.14, ubuntu-latest)	1m 50s
python-314t (3.14t, ubuntu-latest)	1m 17s
	24m 27s

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