feat(amplify): custom domain certificate

[badmintoncryer]

Issue # (if applicable)

Closes #30594.

Reason for this change

Amplify supports for use SSL/TLS certificate for the custom domain but CDK does not support this.

Description of changes

Added customCertificate to DomainProps.

Description of how you validated changes

Added unit and integ tests.

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

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❌ Features must contain a change to a README file.
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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b6a578f
• Result: SUCCEEDED
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[badmintoncryer]

I give up this PR because I need some verified certificate to pass integ test.