feat(cognito): support UserPoolGroup

[mazyu36]

Issue # (if applicable)

Closes #21026.

Reason for this change

To support UserPool Group L2 Construct.

Description of changes

Add UserPoolGroup class.

Description of how you validated changes

Add unit tests and integ tests.

Checklist

• [x] 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

[aws-cdk-automation]

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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).

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4346299ce68c903230e3da20fd5935591fc7ebb8
• Result: SUCCEEDED
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[mergify[bot]]

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).

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