Push Down: Support moving members from Java to Kotlin class

#KT-9485 Fixed

idea/testData/refactoring/pushDown/k2k/clashingMembers.kt

@@ -0,0 +1,32 @@
+abstract class <caret>A {
+    // INFO: {"checked": "true"}
+    open val x: Int = 1
+    // INFO: {"checked": "true"}
+    abstract val y: Boolean
+    // INFO: {"checked": "true", "toAbstract": "true"}
+    open val z: Int = 1
+    // INFO: {"checked": "true"}
+    open fun foo(n: Int) = n + 1
+    // INFO: {"checked": "true"}
+    abstract fun foo(n: Int, m: Int)
+    // INFO: {"checked": "true", "toAbstract": "true"}
+    open fun foo(b: Boolean) = !b
+    // INFO: {"checked": "true"}
+    class X
+}
+
+class B : A {
+    override val x: Int = 2
+
+    override val y: Boolean get() = x > 0
+
+    override val z: Int = 3
+
+    override fun foo(n: Int) = n + 2
+
+    override fun foo(n: Int, m: Int) = n + m
+
+    override fun foo(b: Boolean) = true
+
+    class X
+}