Ability to set a replica as a witness region

[jplock]

Is your request related to a new offering from AWS?

Is this functionality available in the AWS provider for Terraform? See CHANGELOG.md, too.

• No 🛑: please wait to file a request until the functionality is available in the AWS provider
• Yes ✅: please list the AWS provider version which introduced this functionality

Probably not

Is your request related to a problem? Please describe.

I'm unable to set a global table replica to a witness region

Describe the solution you'd like.

To have a flag within replica_regions to mark the replica as a witness region

Describe alternatives you've considered.

Additional context

[github-actions]

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