#414 Cleanup and move classes

client/src/main/java/fitconnect/client/SubmissionSender.java

-package fitconnect.client;
-
-import fitconnect.api.Sender;
-import fitconnect.api.auth.OAuthService;
-import fitconnect.api.auth.OAuthToken;
-import fitconnect.api.data.Data;
-import fitconnect.api.data.Metadata;
-import fitconnect.api.validation.ValidationResult;
-
-import java.io.ByteArrayInputStream;
-
-public class SubmissionSender implements Sender {
-
-    private final OAuthService authService;
-
-    public SubmissionSender(final OAuthService authService){
-        this.authService = authService;
-    }
-
-    @Override
-    public OAuthToken retrieveAuthenticationToken(String clientId, String clientSecret, String... scope) {
-        return authService.authenticate(clientId, clientSecret, scope).orElseThrow();
-    }
-
-    @Override
-    public ValidationResult validateCertificateChain(byte[] chain) {
-        throw new UnsupportedOperationException("Not yet implemented");
-    }
-
-    @Override
-    public Data encryptData(Data unencryptedData) {
-        throw new UnsupportedOperationException("Not yet implemented");
-    }
-
-    @Override
-    public ByteArrayInputStream encryptAttachment(ByteArrayInputStream unencryptedAttachmentBinary) {
-        throw new UnsupportedOperationException("Not yet implemented");
-    }
-
-    @Override
-    public Metadata generateMetadata(byte[] attachment) {
-        throw new UnsupportedOperationException("Not yet implemented");
-    }
-}

client/src/main/java/fitconnect/client/FitCoAuthService.java → client/src/main/java/fitconnect/client/impl/auth/FitCoAuthService.java

-package fitconnect.client;
+package fitconnect.client.impl.auth;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import fitconnect.api.auth.OAuthService;

client/src/test/java/fitconnect/client/OAuthTokenIntegrationTest.java → client/src/test/java/fitconnect/client/auth/OAuthTokenIntegrationTest.java

-package fitconnect.client;
+package fitconnect.client.auth;
 
 import fitconnect.api.auth.OAuthToken;
+import fitconnect.client.impl.auth.FitCoAuthService;
+import fitconnect.client.impl.SubmissionSender;
 import org.junit.jupiter.api.Test;
 
 import java.net.http.HttpClient;
@@ -20,7 +22,7 @@ class OAuthTokenIntegrationTest {
 
         var httpClient = HttpClient.newHttpClient();
         var authService = new FitCoAuthService(httpClient, tokenUrl);
-        var sender = new SubmissionSender(authService);
+        var sender = new SubmissionSender(authService, null);
 
         // When
         OAuthToken token = sender.retrieveAuthenticationToken(clientId, secret, scope);