[FEATURE] added dispatching of the LoginConfirmed event

[Wipster]

It's a bit dirty as the LoginController has to be injected just to pass it to LoginConfirmedEvent constructor. A cleaner way would be FrontendLoginController to extend LoginController. I don't know what side effects this would have though. So this is a simple way to dispatch the PSR-14 event.

[starkstroem23]

Please add this pull request to make the PSR-14 Login event work again.
I test it. Only the use Section must be added:
use TYPO3\CMS\FrontendLogin\Controller\LoginController;
use TYPO3\CMS\FrontendLogin\Event\LoginConfirmedEvent;