Add support for additional python types as dict keys in Struct.to_json #1039

Job	Run time
initialize	2s
lint (ubuntu-22.04, 3.9)	34s
build_sdist (ubuntu-22.04, 3.9)	46s
build (ubuntu-22.04, 3.8, cp38, false)	11m 45s
build (ubuntu-22.04, 3.9, cp39, false)	9m 26s
build (ubuntu-22.04, 3.10, cp310, false)	9m 54s
build (ubuntu-22.04, 3.11, cp311, false)	9m 9s
build (ubuntu-22.04, 3.12, cp312, false)	10m 1s
build (macos-14, 3.11, cp311, false)	5m 31s
build (macos-14, 3.12, cp312, false)	5m 32s
build (windows-2019, 3.12, cp312, false)	17m 39s
test_sdist	0s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy>=2)	1m 13s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	54s
test (ubuntu-22.04, 3.8, false)	2m 20s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.19.5)	1m 27s
test (ubuntu-22.04, 3.9, false)	2m 27s
test (ubuntu-22.04, 3.10, false)	2m 58s
test (ubuntu-22.04, 3.11, false)	2m 41s
test (ubuntu-22.04, 3.12, false)	2m 14s
test (macos-14, 3.11, false)	2m 45s
test (macos-14, 3.12, false)	2m 33s
test (windows-2019, 3.12, false)	5m 2s
publish_release_artifacts	0s
	1h 46m 53s

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