OZG-400 implement searching user in keycloak

goofy-server/pom.xml

...r/src/main/java/de/itvsh/goofy/common/ContextService.java

...ava/de/itvsh/goofy/common/datatypes/StringBasedValue.java

...rc/main/java/de/itvsh/goofy/common/user/UserIdMapper.java

...in/java/de/itvsh/goofy/common/user/UserRemoteService.java

...oofy/common/user/keycloak/KeycloakAdminConfiguration.java

...h/goofy/common/user/keycloak/KeycloakAdminProperties.java

.../itvsh/goofy/common/user/keycloak/KeycloakApiService.java

...goofy/common/user/keycloak/KeycloakUserRemoteService.java

.../goofy/common/user/keycloak/UserRepresentationMapper.java

goofy-server/src/main/resources/application.yml

...c/test/java/de/itvsh/goofy/common/ContextServiceTest.java

...ofy/common/user/keycloak/KeycloakApiFunctionalITCase.java

pom.xml