Add Okta device flow

[jinserk]

Hi all,

I'd like to use httpx_auth for the Okta's device authorization flow, but any of the current flow in httpx_auth looks not fit for this grant flow.

Is it possible to request this to implement? Thank you.

[Colin-b]

Hello @jinserk

This is a feature I would like to add but I don't know when I will be able to work on this. So feel free to start an implementation as a PR if you want this to move faster.