KT-19565: J2K: Determine mutability using iterator

#KT-19565 fixed

j2k/testData/fileOrElement/mutableCollections/Iterator.java

@@ -0,0 +1,19 @@
+import java.util.*;
+
+class Iterator {
+
+    Map<String, String> mutableMap1 = new HashMap<>();
+    Map<String, String> mutableMap2 = new HashMap<>();
+
+    void testFields() {
+        mutableMap1.values().add("")
+        mutableMap2.entrySet().iterator().remove();
+    }
+
+    void testFunctionParameters(Collection<String> immutableCollection, List<Integer> mutableList) {
+        for (Iterator<String> it = immutableCollection.iterator(); it.hasNext(); ) {
+            it.next();
+        }
+        mutableList.listIterator().add(2);
+    }
+}