Refactor semantics service to Java

...c/main/java/at/tuwien/api/semantics/OntologyBriefDto.java

.../main/java/at/tuwien/api/semantics/OntologyCreateDto.java

...pi/src/main/java/at/tuwien/api/semantics/OntologyDto.java

.../src/main/java/at/tuwien/entities/semantics/Ontology.java

dbrepo-metadata-db/setup-schema.sql

dbrepo-semantics-service/.gitignore

...emantics-service/.mvn/wrapper/MavenWrapperDownloader.java

dbrepo-semantics-service/.mvn/wrapper/maven-wrapper.jar

...o-semantics-service/.mvn/wrapper/maven-wrapper.properties

dbrepo-semantics-service/Dockerfile

dbrepo-semantics-service/README.md

dbrepo-semantics-service/app.py

dbrepo-semantics-service/build.sh

dbrepo-semantics-service/healthcheck.sh

dbrepo-semantics-service/list.py

dbrepo-semantics-service/mvnw

dbrepo-semantics-service/mvnw.cmd

dbrepo-semantics-service/onto_feat.py

dbrepo-semantics-service/ontologies/om-2.rdf

dbrepo-semantics-service/pom.xml