Allow enums and structs to be handled by pydantic #1378

Job	Run time
initialize	2s
lint (ubuntu-24.04, 3.9)	34s
build_sdist (ubuntu-24.04, 3.9)	38s
build (ubuntu-24.04, 3.8, cp38, false)	32m 52s
build (ubuntu-24.04, 3.9, cp39, false)	32m 52s
build (ubuntu-24.04, 3.10, cp310, false)	32m 31s
build (ubuntu-24.04, 3.11, cp311, false)	33m 21s
build (ubuntu-24.04, 3.12, cp312, false)	32m 57s
build (macos-14, 3.11, cp311, false)	19m 34s
build (macos-14, 3.12, cp312, false)	19m 7s
build (windows-2019, 3.12, cp312, false)	1h 7m 10s
test_sdist	0s
test (ubuntu-24.04, 3.8, false)	2m 18s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	1m 2s
test (ubuntu-24.04, 3.9, false)	2m 22s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.22.4)	2m 19s
test (ubuntu-24.04, 3.10, false)	2m 13s
test_dependencies (ubuntu-20.04, 3.9, perspective-python<3)	1m 18s
test (ubuntu-24.04, 3.11, false)	2m 13s
test (ubuntu-24.04, 3.12, false)	2m 10s
test (macos-14, 3.11, false)	2m 44s
test (macos-14, 3.12, false)	2m 42s
test (windows-2019, 3.12, false)	5m 23s
publish_release_artifacts	0s
	4h 58m 22s

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