Yubikey Authentication Support

[maxrichie5]

Is your feature request related to a problem? Please describe. My company uses yubikey authentication when interacting with the remote repo.

From the command line this is what the looks like:

$ git pull
Confirm user presence for key ECDSA-SK SHA256:+OZM73LLxxxWYdacxxxxxJOCBM79F2OyoqAAVpxxxxx

Then I touch the yubikey, and it says

User presence confirmed

And does a normal pull.

When using GitUI this happens

Describe the solution you'd like I would like GitUI to support yubikey authentication. Just like the git CLI does.