feat: add bucket acl policy grants

[bryantbiggs]

Description

• add ability to provide grant statement blocks
• update pre-commit hooks to latest
• update complete example to add cloudfront log bucket example using var.grant added here

closes #20

Motivation and Context

• grant is useful in scenarios when setting up access for CloudFront to write logs to your bucket or with cross account access to write files to a bucket you own

Breaking Changes

• no

How Has This Been Tested?

• via updating and deploying complete example

[bryantbiggs]

this does work; since acl and grant conflict (and you will get a message stating as much unless you add this). the alternative would be to change the default for acl to be "" or null, but that would be a breaking change so this seemed like a better compromise. maybe there is a place to better document this? open to suggestions

[bryantbiggs]

@antonbabenko let me know if you have any thoughts on the proposed changes

[antonbabenko]

Thanks, @bryantbiggs !

v1.13.0 has been just released.

[github-actions]

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