Added ability to receive MSISDN from either URL, FORM or BOTH. Make them configurable.
Available methods are configured in same place as other keycloak-laverca related configuration. This however requires three authentication flows to be created. Different clients may have different accepted methods and can be configured under Clients -> client name -> Advanced tab -> Authentication flow overrides
Possible values:
- BOTH (MSISDN allowed to be received from either URL or FORM)
- URL (MSISDN must be received from URL)
- FORM (FORM is displayed to enter MSISDN)
If no value is selected from the list, logger will display error description.