Add new registration type allowing direct registration

[steffen74]

Write a customer announcement
There are now four different registration types for a course or event:
(1) Input modal with following decision process for an invitation or decline, whereby the invitation has to be confirmed again by the registering person.
(2) Link to an external registration
(3) Direct registration without additional decision process but with an input modal
(4) Direct registration and confirmation (without input model)
(5) Direct registration without additional decision process but with an input modal and wit payment
(6) Direct registration and confirmation (without input model) and with payment

Is your feature request related to a problem? Please describe.
Depending on the type of event or course different tpes of registration are needed

Describe the solution you'd like
Add a new enum table CourseRegistrationType with the following values:
APPROVAL_WITH_INPUT
EXTERNAL_REGISTRATION
DIRECT_WITH_INPUT
DIRECT_CONFIRMATION
DIRECT_WITH_INPUT_AND_PAYMENT
DIRECT_CONFIRMATION_AND_PAYMENT

The translations should be:

English dropdown translations:
"Registration with approval process"
"External registration link"
"Direct registration with input form"
"Direct registration"
"Direct registration with input form and payment"
"Direct registration with payment"

German dropdown translations:
"Anmeldung mit Genehmigungsprozess"
"Externe Anmeldung"
"Direkte Anmeldung mit Formular"
"Direkte Anmeldung"
"Direkte Anmeldung mit Formular und Zahlung"
"Direkte Anmeldung mit Zahlung"

Add a new field regtrationType to the table Course.

Additional requirements
List any additional requirements or dependencies that this new feature may have.