Browserless login

[coffee-cup]

Ability to login to Railway when the CLI cannot open a browser directly

See https://github.com/railwayapp/mono/pull/253 for an explanation of how this works

[linear]

RAIL-398 CLI Non-visual Login

Works in codespaces

Explore what other CLIs are doing

Do something like that ✅

- CLI calls railway gets unique login URL

- user goes to URL, logins in if necessary, and presses button to give access to the CLI (stripe does this by showing a random set of words and telling the user to verify the words match the words in the CLI)

- if user verifies CLI, the logged in user will be set as user associated with that login URL - when the CLI is polling it checks if any user has been verified for that user. When one is verified a user token is sent back. CLI keeps polling until a user verifies or cancels the process.

[JakeCooper]

Looks good. Only thing I'd recommend is, to include a message on the browser based loading screen like "Browser didn't open? Try rerunning with --browserless"

IDK up to you. I was stoked about the idea but midway through typing it I was like "ehh"

[coffee-cup]

I think if the browser doesn't open it will error and we will go through the browserless flow anyway. I'll probably not add that message just because it feels less magical ✨