Rohitkuma/replication server side

[rohitkum2506]

Summary

Changes to persist Replication spec in policies in Tables object and to return in Get Response.
Replication spec is represented as:

policies: {
   "replication": {
        "schedules": [
            { 
              "config": {"cluster":"* * * 0/12 * *"}
            }
        ]
    }
}

Changes

• Client-facing API Changes
• Internal API Changes
• Bug Fixes
• New Features
• Performance Improvements
• Code Style
• Refactoring
• Documentation
• Tests

For all the boxes checked, please include additional details of the changes made in this pull request.

Testing Done

• Manually Tested on local docker setup. Please include commands ran, and their output.
• Added new tests for the changes made.
• Updated existing tests to reflect the changes made.
• No tests added or updated. Please explain why. If unsure, please feel free to ask for help.
• Some other form of testing like staging or soak time in production. Please explain.

For all the boxes checked, include a detailed description of the testing done for the changes made in this pull request.

Additional Information

• Breaking Changes
• Deprecations
• Large PR broken into smaller PRs, and PR plan linked in the description.

For all the boxes checked, include additional details of the changes made in this pull request.