chore(python): Add `py-polars` to Cargo workspace #3671

Job	Run time
check-features	7m 28s
check-wasm	4m 47s
integration-test (ubuntu-latest)	4m 4s
test (ubuntu-latest)	19m 13s
integration-test (windows-latest)	5m 49s
test (windows-latest)	7m 34s
	48m 55s

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