fix: add OAuth server default timeout W-19549750

[cristiand391]

What does this PR do?

Adds a (non-configurable) 2 minutes timeout to the OAuth server.

WebServer starts the timer when starting the server via await WebServer.start(), also exposes a setTimeoutCallback method for WebOAuthServer to set a callback to clean up server-dependent code like WebOAuthServer.authorizeAndSave.

There's a native setTimeout method for when the socket is active:
https://nodejs.org/api/http.html#serversettimeoutmsecs-callback

It doesn't work for us because that requires a request to hit the server (and fail), so instead we use setTimeout while starting the server.

Before

OAuth server hangs indefinitely until a successful auth happens (or other req fails)

After

Server times out after 2 minutes.

Testing instructions:

1. checkout this branch and yarn compile
2. yarn link it into plugin-auth
3. link the plugin and run time sf org login web, see it time out:

NOTE: in this screenshot I modified the timeout to 10s for testing, you should see a 2 min timeout:

What issues does this PR fix or reference?

@W-19549750@

[mdonnalley]

QA:

🟢 sf org login web timeouts after 5 minutes