wip: Support `to_string` for Duration dtype #12671

Job	Run time
integration-test (ubuntu-latest)	1m 38s
test (ubuntu-latest)	1m 38s
integration-test (windows-latest)	1m 22s
check-features	1m 37s
test (windows-latest)	1m 21s
check-wasm	1m 36s
	9m 12s

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