Add Cluster Mode support to ReplicationGroup

[knottnt]

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Description of changes:

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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[knottnt]

/test all

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[APPROVALNOTIFIER] This PR is APPROVED

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[knottnt]

/test all

[knottnt]

/test all

[knottnt]

/retest

[knottnt]

/retest

[knottnt]

/test all

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@knottnt: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
elasticache-verify-code-gen	9c19e39	link	true	/test elasticache-verify-code-gen
elasticache-kind-e2e	9c19e39	link	true	/test elasticache-kind-e2e

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