Allow enums and structs to be handled by pydantic #1369

Job	Run time
initialize	2s
build_sdist (ubuntu-24.04, 3.9)	43s
build (ubuntu-24.04, 3.8, cp38, false)	33m 27s
build (ubuntu-24.04, 3.9, cp39, false)	33m 3s
lint (ubuntu-24.04, 3.9)	40s
build (ubuntu-24.04, 3.10, cp310, false)	34m 39s
build (ubuntu-24.04, 3.11, cp311, false)	32m 43s
build (ubuntu-24.04, 3.12, cp312, false)	33m 13s
build (macos-14, 3.11, cp311, false)	21m 31s
build (macos-14, 3.12, cp312, false)	20m 57s
build (windows-2019, 3.12, cp312, false)	1h 7m 8s
test_sdist	0s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	1m 4s
test (ubuntu-24.04, 3.8, false)	2m 19s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.22.4)	2m 21s
test (ubuntu-24.04, 3.9, false)	2m 13s
test_dependencies (ubuntu-20.04, 3.9, perspective-python<3)	1m 18s
test (ubuntu-24.04, 3.10, false)	3m 5s
test (ubuntu-24.04, 3.11, false)	1m 59s
test (ubuntu-24.04, 3.12, false)	2m 12s
test (macos-14, 3.11, false)	3m 19s
test (macos-14, 3.12, false)	3m 52s
test (windows-2019, 3.12, false)	6m 6s
publish_release_artifacts	0s
	5h 7m 54s

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