Updated more metrics

...e/src/main/java/at/tuwien/endpoints/MetadataEndpoint.java

...e/src/main/java/at/tuwien/endpoints/OntologyEndpoint.java

...rc/main/java/at/tuwien/endpoints/PersistenceEndpoint.java

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

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

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

...rc/main/java/at/tuwien/endpoints/TableColumnEndpoint.java

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

...t/java/at/tuwien/endpoints/SemanticsEndpointUnitTest.java

...rc/test/java/at/tuwien/mvc/PrometheusEndpointMvcTest.java