feat(website_bucket_policy): Allow to be passed externally #286

Job	Run time
check-format	5s
validations (examples/no-cert-no-hosted-zone)	1m 1s
validations (examples/complete)	54s
validations (examples/ordered-cache-behavior)	58s
validations (examples/no-hosted-zone)	58s
validations (examples/no-cert)	58s
	4m 54s

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