feat(rds): General Purpose gp3 storage volumes for database instance

[jogold]

Add support for GP3 storage type. Closes #23036

See https://aws.amazon.com/about-aws/whats-new/2022/11/amazon-rds-general-purpose-gp3-storage-volumes/

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[gitpod-io]

[robertd]

Closes #23036

[kaizencc]

Looks good to me @jogold. Appreciate the small refactor that makes this more maintainable.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).