Optimize ParameterizedTypeImpl.getActualTypeArguments: remove defensive clone

Return direct reference to internal array instead of cloning on every call.
Callers read elements but do not modify the array, so cloning is unnecessary.

This optimization targets a hot spot from JFR profiling:
TypeUtilities ParameterizedTypeImpl.getActualTypeArguments accounted for
320 samples (39 percent of all getActualTypeArguments calls).

The constructor still clones the input array to prevent external modification.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jdereg

src/main/java/com/cedarsoftware/util/TypeUtilities.java

@@ -501,7 +501,8 @@ public ParameterizedTypeImpl(Class<?> raw, Type[] args, Type owner) {
 
         @Override
         public Type[] getActualTypeArguments() {
-            return args.clone();
+            // Return direct reference for performance - callers should not modify
+            return args;
         }
 
         @Override