Implemented the upload endpoint

.docker/docker-compose.yml

.docs/.openapi/api-data.yaml

.docs/.openapi/api-metadata.yaml

.docs/.openapi/api.yaml

.docs/api/storage-service.md

.docs/api/upload-service.md

.docs/changelog.md

.docs/images/screenshots/storage-service-filer.png

dbrepo-analyse-service/Pipfile.lock

dbrepo-analyse-service/lib/dbrepo-1.7.0-py3-none-any.whl

dbrepo-analyse-service/lib/dbrepo-1.7.0.tar.gz

dbrepo-auth-service/dbrepo-realm.json

...o-auth-service/listeners/target/create-event-listener.jar

...ice/src/main/java/at/tuwien/endpoints/UploadEndpoint.java

...ava/at/tuwien/gateway/MetadataServiceGatewayUnitTest.java

...va/at/tuwien/gateway/impl/MetadataServiceGatewayImpl.java

...vices/src/main/java/at/tuwien/service/StorageService.java

...ain/java/at/tuwien/service/impl/StorageServiceS3Impl.java

dbrepo-gateway-service/dbrepo.conf

...i/src/main/java/at/tuwien/api/file/UploadResponseDto.java