OZG-3961 - add licence header

src/main/java/de/ozgcloud/operator/Config.java

...ain/java/de/ozgcloud/operator/OzgOperatorApplication.java

.../java/de/ozgcloud/operator/SpringNativeConfiguration.java

...in/java/de/ozgcloud/operator/keycloak/KeycloakClient.java

...java/de/ozgcloud/operator/keycloak/KeycloakException.java

...cloud/operator/keycloak/KeycloakGenericRemoteService.java

...a/de/ozgcloud/operator/keycloak/KeycloakResultParser.java

...e/ozgcloud/operator/keycloak/OzgCustomResourceStatus.java

...gcloud/operator/keycloak/client/KeycloakClientMapper.java

...or/keycloak/client/KeycloakClientPreconditionService.java

...ud/operator/keycloak/client/KeycloakClientReconciler.java

...operator/keycloak/client/KeycloakClientRemoteService.java

...cloud/operator/keycloak/client/KeycloakClientService.java

.../ozgcloud/operator/keycloak/client/OzgKeycloakClient.java

...cloud/operator/keycloak/client/OzgKeycloakClientSpec.java

...oud/operator/keycloak/client/OzgKeycloakClientStatus.java

...ozgcloud/operator/keycloak/group/KeycloakGroupMapper.java

...ator/keycloak/group/KeycloakGroupPreconditionService.java

...loud/operator/keycloak/group/KeycloakGroupReconciler.java

...d/operator/keycloak/group/KeycloakGroupRemoteService.java