Notification Service Refactoring

All Submissions:

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• [YES] I have added an explanation of what changes in this merge do and why we should include it?
• [NO] Does the MR contain pipeline/ helm chart related changes?
• [NO] I have updated the documentation accordingly.
• [NO] I have added tests to cover my changes.
• [NA] All new and existing tests passed.
• [YES] My code follows the code style of this project.
• [NA] I ran lint checks locally prior to submission.

What is the issue or story related to the change?

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The MR contains changes to redesign notification service in order to make the code extensible and support multiple message brokers in future.

High level design: In the PubSubEndpoint Controller, handlers have been added in order to call the functions which fetches out the subscription and notify the subscriber endpoint.

Issue: #25 (closed)

Test coverage:

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Does this introduce a breaking change?

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• [NO]

Pending items

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Implementation of POJO to contain request body details

Reviewer request

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• Please provide an ETA when you plan to review this MR. Write a comment to decline or provide an ETA.
• Block the MR if you feel there is less testing or no details in the MR
• Please cover the following aspects in the MR -- Coding design: <Harshit/Komal/Vishnu> -- Backward Compatibility: <Harshit/Komal/Vishnu> -- Feature Logic: <Harshit/Komal/Vishnu>

Other information

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