🔐 SPFx toolkit should support login over your own app reg

[Adam-it]

Due to upcoming changes we need to adapt the product so that it will be possible to login over your own app reg. We need to:

• [ ] add functionlity to provide client id and tenant id when sign in
• [ ] add more support for the modified login process vs code walkthrough
• [ ] add more guidance on how to set up such an app with some copy paste methods over products user could already have. SPFx toolkit could even initial install for example AZ CLI so that this may be ready
• [ ] add error handling with notify redirecting to login page when enterprise app is missing