Allow enums and structs to be handled by pydantic #1383

Job	Run time
initialize	2s
lint (ubuntu-24.04, 3.9)	36s
build_sdist (ubuntu-24.04, 3.9)	46s
build (ubuntu-24.04, 3.8, cp38, false)	33m 51s
build (ubuntu-24.04, 3.9, cp39, false)	34m 7s
build (ubuntu-24.04, 3.10, cp310, false)	32m 45s
build (ubuntu-24.04, 3.11, cp311, false)	32m 33s
build (ubuntu-24.04, 3.12, cp312, false)	33m 29s
build (macos-14, 3.11, cp311, false)	22m 21s
build (macos-14, 3.12, cp312, false)	20m 18s
build (windows-2019, 3.12, cp312, false)	1h 3m 21s
test_sdist	0s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	1m 11s
test (ubuntu-24.04, 3.8, false)	3m 6s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.22.4)	2m 19s
test (ubuntu-24.04, 3.9, false)	2m 3s
test_dependencies (ubuntu-20.04, 3.9, perspective-python<3)	1m 17s
test (ubuntu-24.04, 3.10, false)	2m 11s
test (ubuntu-24.04, 3.11, false)	2m 56s
test (ubuntu-24.04, 3.12, false)	2m 11s
test (macos-14, 3.11, false)	2m 57s
test (macos-14, 3.12, false)	3m 5s
test (windows-2019, 3.12, false)	6m 8s
publish_release_artifacts	0s
	5h 3m 33s

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