Oauth `force_login`

[aeharding]

Is your feature request related to a problem? Please describe.

Mastodon has force_login for oauth login as a query parameter. Without it, you can't authenticate via oauth to multiple accounts on the same instance.

https://docs.joinmastodon.org/methods/oauth/#authorize

Describe the solution you'd like

force_login supported

Describe alternatives you've considered

N/A

Additional context

N/A