feat(rds): support auto-pause configuration for Aurora Serverless v2

[Tietew]

Issue # (if applicable)

Closes #32280.
Closes #32563.

Reason for this change

Aurora Serverless v2 DB instances can specify the time period of inactivity before auto-pause.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-serverless-v2-auto-pause.html

Description of changes

Added the serverlessV2AutoPauseDuration prop for DatabaseCluster.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Added unit tests and an integ test.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[go-to-k]

The code is fine, but left very trivial comments.

[Tietew]

@go-to-k
Thanks for review! I've pushed updates.

[go-to-k]

Thanks. Looks good!

[vishaalmehrishi]

Re #34173 (comment), I have reached out to the RDS team to ask about their engine support plan for auto-pause.

Blocking this PR while I await their response.

[Tietew]

@vishaalmehrishi Thanks for review.
I understand ClusterEngine validates whether the specified engine version supports s3Import and s3Export features.

If we can add the serverlessV2AutoPause feature flag like s3Import and s3Export,
It will not depend AWS's support plan.

Pull request has been modified.

[vishaalmehrishi]

Please see the comments about setting the supported feature configuration in a more maintainable way.

Pull request has been modified.

[Tietew]

@vishaalmehrishi
Pushed. How about this change?

Pull request has been modified.

[mergify]

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 13636d4
• Result: SUCCEEDED
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[mergify]

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