Add functionality to verify user email.

[VerzCar]

I'm creating users from my own user-service. In there I create the user via CreateUser() and then I'd like to send a verification email, so the user can verify his email.

The easiest solution would be to implement another functionality that sends a POST to the /send-verify-email endpoint as described here: [PUT /{realm}/users/{id}/send-verify-email] keycloak docs