🐛 [ui] add flag to allow to sign in using browser instead of webview on desktop

[lesnitsky]

Default webview doesn't have any credentials cached, so we want to allow developers to be able to implement sign-in flows that are leading the user to browser instead of webview, so OAuth credentials could be reused

[lesnitsky]

The last step of the auth flow in the browser would require opening a deep link that contains auth info and sending it to the desktop app. Deep links on macOS are not doable until flutter/flutter/issues/41471 is resolved.

/cc @csells

[amorenew]

@lesnitsky
The blocking issue is closed flutter/flutter#41471

[github-actions]

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