Add user login functionality and queue support

[bajramemini]

First of all, thank you for creating and maintaining this amazing package! It's been incredibly helpful in my current project. I'd like to contribute some enhancements:

1. Implemented user login functionality with login() and getUser() methods
2. Added support for using MsGraph within queued jobs and commands
3. Updated the getAccessToken() method to use the logged-in user when available
4. Improved error handling in the getUserId() method
5. Added new tests to cover the new functionality
6. Updated documentation to explain usage with queues and the new login feature

These changes aim to improve the package's flexibility, especially in scenarios involving background jobs and multiple users.
I'm open to any feedback or suggestions for improvements. Thanks for considering this contribution!
Bajram