Support Date32 type with Polars #896

Job	Run time
build-vegafusion-python-embed-linux-arm64	12m 15s
build-vegafusion-python-embed-linux-64	13m 30s
build-vegafusion-jupyter-packages	9m 7s
build-vegafusion-packages	1m 20s
build-vegafusion-python-embed-osx-64	23m 3s
build-vegafusion-python-embed-osx-arm64	23m 21s
build-vegafusion-python-embed-win-64	25m 55s
build-vegafusion-server-linux-64	8m 57s
build-vegafusion-server-linux-arm64	10m 53s
build-vegafusion-server-osx-64	5m 46s
build-vegafusion-server-osx-arm64	5m 44s
build-vegafusion-server-win-64	23m 16s
build-vegafusion-wasm	7m 9s
check-rust	4m 31s
test-rust (ubuntu-20.04)	23m 49s
test-rust (windows-2022)	46m 15s
test-rust (macos-11)	35m 6s
test-vegafusion-jupyter-linux-64	26m 24s
test-vegafusion-python-linux-64	9m 27s
test-vegafusion-python-osx-64	26m 50s
test-vegafusion-python-win-64	14m 32s
	5h 57m 10s

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