allow extra keywords in structured datatype validation #3567

Job	Run time
pre-commit	37s
jsonschema	0s
core / Load tox environments	3s
core / Python 3.13 coverage	2m 25s
core / Python 3.12 coverage	2m 16s
core / Python 3.11 coverage	1m 52s
core / Python 3.10 coverage	2m 7s
core / Python 3.9 coverage	2m 7s
dev / Load tox environments	4s
test / Load tox environments	6s
asdf-schemas / Load tox environments	6s
compatibility / Load tox environments	3s
oldest / Load tox environments	4s
dev / py310-devdeps-parallel (ubuntu-latest)	1m 23s
oldest / py39-oldestdeps-parallel (ubuntu-latest)	1m 4s
dev / py311-devdeps-parallel (ubuntu-latest)	1m 25s
dev / py312-devdeps-parallel (ubuntu-latest)	1m 19s
dev / py313-devdeps-parallel (ubuntu-latest)	1m 23s
dev / py311-pytestdev-parallel (ubuntu-latest)	59s
compatibility / compatibility (ubuntu-latest)	3m 25s
test / py311-parallel (macos-latest)	41s
test / py311-parallel (windows-latest)	2m 42s
asdf-schemas / asdf-standard (ubuntu-latest)	35s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 27s
	28m 13s

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