Remove NestedField #717

Job	Run time
mypy	3m 33s
py3.13 \| macos \| integration tests	4m 17s
py3.13 \| macos \| unit tests	4m 14s
py3.13 \| ubuntu \| integration tests	4m 15s
py3.13 \| ubuntu \| unit tests	4m 15s
py3.13 \| windows \| integration tests	4m 3s
py3.13 \| windows \| unit tests	3m 58s
py3.10 \| ubuntu \| integration tests	4m 13s
py3.10 \| ubuntu \| unit tests	4m 14s
py3.11 \| ubuntu \| unit tests	4m 14s
py3.12 \| ubuntu \| unit tests	4m 14s
merge-test-artifacts	1s
	45m 31s

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