smbd: implement SMB_FILE_NORMALIZED_NAME_INFORMATION handling
Windows 10 (1803 and higher) support and use SMB_FILE_NORMALIZED_NAME_INFORMATION calls over the network. As a fallback (in case the server don't support it) the client traverses all path components, which is very expensive.
Implementing SMB_FILE_NORMALIZED_NAME_INFORMATION is very cheap for us as the open already went through unix_convert() and we have the information the client is asking for.