[feature-request]: `gh auth login` flag that adds ssh keys to github without prompting user

### Describe the feature or problem you’d like to solve

It'd be nice to add a flag to the cli that add the SSH keys to github, something like `upload-ssh-keys`. This should remove the need for this user interaction:
```
$ gh auth login
...
? Upload your SSH public key to your GitHub account? [Use arrows to move, type to filter]
> /Users/luccab/.ssh/id_ed25519.pub
Skip
```