Add the ability to set the PublicAccessBlock config on S3 buckets

[hiddenillusion]

Even though S3 buckets/objects do not allow public access by default, a best practice is to explicitly disable public access to prevent inadvertently making a bucket/object public in the future.

This can be accomplished by making a request to put_public_access_block() & setting all of the values in PublicAccessBlockConfiguration to "True".