Merge branch 'feature/566-check-metadata-schema' into 'main'

...ava/de/fitko/fitconnect/api/config/ApplicationConfig.java

.../main/java/de/fitko/fitconnect/api/config/Subscriber.java

...rc/main/java/de/fitko/fitconnect/api/services/Sender.java

...rc/main/java/de/fitko/fitconnect/client/SenderClient.java

...ava/de/fitko/fitconnect/client/factory/ClientFactory.java

...ava/de/fitko/fitconnect/client/ClientIntegrationTest.java

...est/java/de/fitko/fitconnect/client/SenderClientTest.java

...de/fitko/fitconnect/client/factory/ClientFactoryTest.java

.../main/java/de/fitko/fitconnect/core/SubmissionSender.java

...t/java/de/fitko/fitconnect/core/SubmissionSenderTest.java

sdk.conf