Adding replication (CCR) plugin interface and classes to common-utils

[aggarwalShivani]

Description

Background:

• This change is required for a new feature being added in ism plugin - unfollow-action #726 - integrating ccr and ism plugins.
• For this feature, ism plugin needs to invoke stop-replication action from ccr. As both ccr and ism need to invoke some common code, the common code can be moved to common-utils, as done previously for other plugins too. For ex. notifications plugin
• As sharing of libraries also leads to a type-cast and class-loading issue - previously seen with notification plugin - the request object needs to be of a higher-level class from opensearch-core like ActionRequest and later be recreated into required type i.e. StopIndexReplicationRequest.

Proposed Solution:

1. Common-utils: Move common code of stop-replication from ccr project to common-utils.
2. CCR: Modify ccr plugin to consume classes from common-utils. Also, create a new TransportAction that transforms the request into required type and invokes TransportStopIndexReplicationAction.
3. ISM: Add new action in ism (FYI - This is an alternative approach for this feature. I had also raised a draft PR with a different approach, but we didnt go ahead with it as it required changes in opensearch-core as well.)

Change description: Code for StopIndexReplicationRequest and StopIndexReplicationAction are moved to common-utils. Added UTs for both the new classes added. This PR caters to point 1 of the proposed solution.

Issues Resolved

Related Issues unfollow-action #726

Check List

• [x] New functionality includes testing.
  • [x] All tests pass
• ~[ ] New functionality has been documented.~
  • ~[ ] New functionality has javadoc added~
• [x] Commits are signed per the DCO using --signoff

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