Login within Bottom Bar / VsCode

[larkinds]

Keep entire authentication process within VScode

[jkmartindale]

If I remember our conversation correctly from yesterday, this goal is to open a pop-up login window inside of VS Code instead of in a web browser. I just realized that the browser has a few advantages:

• If the user is already logged in, they'll be fast-tracked to the consent form
• Once a user logs in, they'll be remembered for future authorization sessions (assuming they don't log out)
• The browser could have things making it easier to log in, e.g. password managers or browser autofill

A lot of user preference lives in the browser. We lose all of these advantages once we pop a webview in VS Code instead.

The main issue with browser auth, the ugly success page, is fixed by #26, so this issue isn't as necessary anyway.

[jkmartindale]

Then again, Karan suggested this during pod demos today. So maybe this is something that users would expect anyway, and I'm wrong to think user preference is the browser.