feat(BE): implement CRUD API for users (#243)

* feat: add user CRUD methods to the repo

* feat: implement user controller and router

* feat: integrate and documente user CRUD endpoints

* Revert "chore: setup TypeScript linting with ESLint"

This reverts commit e9eaeb9.

* fix & refactor: see details

- add email check in updateUser
- remove unnecessary type
- rename UserController file

* implement review

* Revert "Revert "chore: setup TypeScript linting with ESLint""

This reverts commit 49dfafd.

* fix/docs: fix path

Author: Muatasim-Aswad