feat: Add `list.pad_start()` #14488

Job	Run time
test (ubuntu-latest)	3m 48s
check-wasm	6m 26s
check-features	9m 56s
test (windows-latest)	9m 39s
integration-test (ubuntu-latest)	1m 51s
integration-test (windows-latest)	6m 3s
	37m 43s

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