Is your feature request related to a problem? Please describe.
After connecting to a mailbox and then attempting to call $client->getFolder('INBOX') I get the following error:
Uncaught exception from Webklex\PHPIMAP\Exceptions\ImapServerErrorException in vendor\webklex\php-imap\src\Connection\Protocols\ImapProtocol.php, line=306. I stopped at than line with my debugger to see the contents of $tokens contained the message "BAD User is authenticated but not connected." This is FAR more meaningful than simply the name of the exception.

Describe the solution you'd like
I consider it to be bad form to throw an exception without an error description. Please include proper descriptions when throwing errors as I HATE having to debug somebody else's code.

Describe alternatives you've considered
none

Additional context
none