Add identity-based TLS auth and UI for client/daemon auth

Add identity-based TLS authentication and use public keys to authenticate access.
This is an implementation of the proposal from #7667.

FSNotify support has not been added to detect changes to authorized keys but may be added in a follow up PR.

Can probably break this out into a function.  This block is specifically handling the unknown server fallback case which involves prompting the user about trusting the server's public key.