[I] Implement ext-info-in-auth@openssh.com extension [mina-sshd]

["gnodet (via GitHub)" <gi...@apache.org>]

gnodet opened a new issue, #562:
URL: https://github.com/apache/mina-sshd/issues/562

   ### Description
   
   See https://github.com/openssh/openssh-portable/blob/V_9_8/PROTOCOL#L167-L184
   
   > This protocol extension allows the SSH2_MSG_EXT_INFO to be sent
   > during user authentication. RFC8308 does allow a second
   > SSH2_MSG_EXT_INFO notification, but it may only be sent at the end
   > of user authentication and this is too late to signal per-user
   > server signature algorithms.
   > 
   > Support for receiving the SSH2_MSG_EXT_INFO message during user
   > authentication is signalled by the client including a
   > "ext-info-in-auth@openssh.com" key via its initial SSH2_MSG_EXT_INFO
   > set after the SSH2_MSG_NEWKEYS message.
   > 
   > A server that supports this extension MAY send a second
   > SSH2_MSG_EXT_INFO message any time after the client's first
   > SSH2_MSG_USERAUTH_REQUEST, regardless of whether it succeed or fails.
   > The client SHOULD be prepared to update the server-sig-algs that
   > it received during an earlier SSH2_MSG_EXT_INFO with the later one.
   > 
   
   ### Motivation
   
   Even without implementing per-user server signature algorithms, supporting this extension on the server side would bring better support when connecting to OpenSSH servers.
   
   ### Alternatives considered
   
   _No response_
   
   ### Additional context
   
   _No response_


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