Updated interfaces of query service, added security to all backend services

.../src/main/java/at/tuwien/endpoints/ContainerEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/ImageEndpoint.java

...n/java/at/tuwien/endpoints/ContainerDatabaseEndpoint.java

fda-identifier-service/pom.xml

...src/main/java/at/tuwien/endpoints/IdentifierEndpoint.java

...ervices/src/main/java/at/tuwien/auth/AuthTokenFilter.java

...ervices/src/main/java/at/tuwien/config/GatewayConfig.java

...ces/src/main/java/at/tuwien/config/WebSecurityConfig.java

.../java/at/tuwien/gateway/AuthenticationServiceGateway.java

...tuwien/gateway/impl/AuthenticationServiceGatewayImpl.java

...e/services/src/main/java/at/tuwien/mapper/UserMapper.java

...ava/at/tuwien/api/database/query/ExecuteStatementDto.java

...ain/java/at/tuwien/api/database/query/QueryResultDto.java

fda-query-service/pom.xml

...ervice/src/main/java/at/tuwien/endpoint/DataEndpoint.java

...rvice/src/main/java/at/tuwien/endpoint/QueryEndpoint.java

...rc/test/java/at/tuwien/endpoint/DataEndpointUnitTest.java

...java/at/tuwien/endpoint/QueryEndpointIntegrationTest.java

...c/test/java/at/tuwien/endpoint/QueryEndpointUnitTest.java

...st/java/at/tuwien/service/DataServiceIntegrationTest.java