separate workflow impl from interface

Author: THardy98

workers/java/harness/src/test/java/io/temporal/omes/harness/ProjectHarnessEchoWorkflow.java

@@ -8,12 +8,3 @@ public interface ProjectHarnessEchoWorkflow {
   @WorkflowMethod
   String run(String payload);
 }
-
-class ProjectHarnessEchoWorkflowImpl implements ProjectHarnessEchoWorkflow {
-  public ProjectHarnessEchoWorkflowImpl() {}
-
-  @Override
-  public String run(String payload) {
-    return payload;
-  }
-}

workers/java/harness/src/test/java/io/temporal/omes/harness/ProjectHarnessEchoWorkflowImpl.java

@@ -0,0 +1,10 @@
+package io.temporal.omes.harness;
+
+public final class ProjectHarnessEchoWorkflowImpl implements ProjectHarnessEchoWorkflow {
+  public ProjectHarnessEchoWorkflowImpl() {}
+
+  @Override
+  public String run(String payload) {
+    return payload;
+  }
+}