Allow enums and structs to be handled by pydantic (#428) #1389

Job	Run time
initialize	3s
lint (ubuntu-24.04, 3.9)	36s
build_sdist (ubuntu-24.04, 3.9)	43s
build (ubuntu-24.04, 3.8, cp38, false)	33m 16s
build (ubuntu-24.04, 3.9, cp39, false)	32m 52s
build (ubuntu-24.04, 3.10, cp310, false)	33m 19s
build (ubuntu-24.04, 3.11, cp311, false)	32m 38s
build (ubuntu-24.04, 3.12, cp312, false)	33m 36s
build (macos-14, 3.11, cp311, false)	17m 52s
build (macos-14, 3.12, cp312, false)	21m 1s
build (windows-2019, 3.12, cp312, false)	1h 5m 48s
test_sdist	0s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	1m 11s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.22.4)	2m 5s
test_dependencies (ubuntu-20.04, 3.9, perspective-python<3)	1m 15s
test (ubuntu-24.04, 3.8, false)	2m 28s
test (ubuntu-24.04, 3.9, false)	2m 14s
test (ubuntu-24.04, 3.10, false)	2m 21s
test (ubuntu-24.04, 3.11, false)	2m 1s
test (ubuntu-24.04, 3.12, false)	2m 9s
test (macos-14, 3.11, false)	3m 9s
test (macos-14, 3.12, false)	2m 58s
test (windows-2019, 3.12, false)	6m 24s
publish_release_artifacts	0s
	4h 59m 59s

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