#414 Introduce client factory to be able to construct the client without guice

...ect/api/domain/model/submission/AvailableSubmissions.java

...onnect/api/domain/model/submission/CreatedSubmission.java

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

client/src/main/java/de/fitko/fitconnect/TestRunner.java

...c/main/java/de/fitko/fitconnect/client/ClientFactory.java

...n/java/de/fitko/fitconnect/client/FluentSenderClient.java

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

...ava/de/fitko/fitconnect/dependency/ApplicationConfig.java

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

...fitko/fitconnect/impl/metadata/MetadataUploadService.java