fix(android): snapshot listeners before iterating to avoid ConcurrentModificationException

onChanged runs on Dispatchers.Default; addListener/removeListener run on
the JS thread. A concurrent mutation during iteration throws CME.

The ensureValueListenerJob double-create concern in the review is not real
since all calls come from the single-threaded JS side.

Author: mfazekas

android/src/main/java/com/margelo/nitro/rive/BaseHybridViewModelPropertyImpl.kt

@@ -35,7 +35,7 @@ class BaseHybridViewModelPropertyImpl<T> : BaseHybridViewModelProperty<T> {
   }
 
   override fun onChanged(value: T) {
-    listeners.values.forEach { listener ->
+    listeners.values.toList().forEach { listener ->
       listener(value)
     }
   }