refactor-#418: Added role type in frontend and backend

[AMS003010]

Summary

I have added the role type (as an enum) in both the backend and frontend and replaced the "USER" and "ADMIN" types with Role.User and Role.Admin

Description

Explain in detail what this PR is all about. This should include the problem you're solving, the approach taken, and any technical details that reviewers need to know.

Images

None

Issue(s) Addressed

Closes Issue #418

Prerequisites

• [x] Have you followed all the CONTRIBUTING GUIDELINES?

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[github-actions[bot]]

Hey @AMS003010! Thanks for sticking to the guidelines! High five! 🙌🏻

[krishnaacharyaa]

Hi @AMS003010 can you kindly address the review comments and close this by today?

[krishnaacharyaa]

Yeah I actually didn't run the application 😅

@AMS003010 kindly run the application and push the required changes

[krishnaacharyaa]

@AMS003010 did you run the application?

[krishnaacharyaa]

@AMS003010

[AMS003010]

@krishnaacharyaa Yeah I did It worked without any errors

[AMS003010]

@krishnaacharyaa Thanks a lot for the help 😁