[REFACTOR] :recycle: rename `admin.controller.ts` to `user.controller.ts`

[aayushchugh]

Description

in admin.controller.ts there is code related to users so we can rename it to improve code quality and maintain code standards

Anything else?

No response

[YashJain2409]

Can i work on this?

[aayushchugh]

@YashJain2409 Yes you can work on this but remember that main branch is updated so you can't just rename to file
but you have to move the content of admin.controller.ts to user.controller.ts (which is already existed) and update the
imports accordingly

[YashJain2409]

i have created pull request,you can review it