Support Date32 type with Polars #894

Job	Run time
build-vegafusion-packages	1m 50s
build-vegafusion-python-embed-linux-64	11m 23s
build-vegafusion-jupyter-packages	9m 23s
build-vegafusion-python-embed-linux-arm64	12m 25s
build-vegafusion-python-embed-osx-64	23m 48s
build-vegafusion-python-embed-osx-arm64	25m 2s
build-vegafusion-python-embed-win-64	26m 31s
build-vegafusion-server-linux-64	11m 43s
build-vegafusion-server-linux-arm64	10m 43s
build-vegafusion-server-osx-64	22m 34s
build-vegafusion-server-osx-arm64	21m 32s
build-vegafusion-wasm	7m 33s
check-rust	4m 33s
build-vegafusion-server-win-64	25m 53s
test-rust (ubuntu-20.04)	24m 16s
test-rust (windows-2022)	49m 54s
test-rust (macos-11)	55m 13s
test-vegafusion-python-linux-64	8m 37s
test-vegafusion-jupyter-linux-64	27m 1s
test-vegafusion-python-osx-64	25m 12s
test-vegafusion-python-win-64	13m 48s
	6h 58m 54s

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