Push Down: Support moving members from Java to Kotlin class

#KT-9485 Fixed

idea/testData/refactoring/pushDown/j2k/fromClassUsageConflicts.java

@@ -0,0 +1,29 @@
+abstract class <caret>A {
+    // INFO: {"checked": "true"}
+    int x = 2 * 3;
+    // INFO: {"checked": "true"}
+    static String X = "1" + "2";
+
+    // INFO: {"checked": "true"}
+    boolean foo(int n) {
+        return n > 0;
+    }
+
+    // INFO: {"checked": "true"}
+    static String foo2(int n) {
+        return "_" + n + "_";
+    }
+
+    // INFO: {"checked": "true"}
+    abstract int bar(String s);
+
+    // INFO: {"checked": "true"}
+    class X {
+
+    }
+
+    // INFO: {"checked": "true"}
+    static class Y {
+
+    }
+}