Implement "Get Specific User by ID" in UserController

[AhmedFatthy1040]

Issue Title: Implement "Get Specific User by ID" in UserController

Issue Description:

As an admin, I want to be able to retrieve the details of a specific user by their user ID so that I can view and manage individual user information effectively.

Tasks:

1. Create an endpoint in the UserController that allows the admin to fetch details of a user by their ID.
2. Implement security measures to ensure only admin users can access this endpoint.

Acceptance Criteria:

• Admin should be able to make a GET request to /api/users/{userId} and retrieve user information.
• Return 404 Not Found if the user does not exist.
• Return 200 OK with user details if the user is found.
• Ensure proper error handling and validation.
• Apply proper authorization so that only users with the "admin" role can access this endpoint.

[MadhuKashyap]

@AhmedFatthy1040 i would like to work on this. Kindly assign