Add checkEntryHeader to output entry

Author: slinkydeveloper

sdk-core/src/main/java/dev/restate/sdk/core/Entries.java

@@ -64,6 +64,12 @@ String getName(OutputEntryMessage expected) {
       return expected.getName();
     }
 
+    @Override
+    void checkEntryHeader(OutputEntryMessage expected, MessageLite actual)
+        throws ProtocolException {
+      Util.assertEntryEquals(expected, actual);
+    }
+
     @Override
     public void trace(OutputEntryMessage expected, Span span) {
       span.addEvent("Output");