Move: Nested classes support

#KT-9027 In Progress

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelCompanionConflict/after/test.kt

@@ -0,0 +1,15 @@
+package test
+
+class A {
+    companion object {
+        fun Int.extFoo(n: Int) {}
+
+        val Int.extBar: Int get() = 1
+    }
+
+    class B {
+        fun test() {
+            1.extFoo(1.extBar)
+        }
+    }
+}

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelCompanionConflict/before/test.kt

@@ -0,0 +1,15 @@
+package test
+
+class A {
+    companion object {
+        fun Int.extFoo(n: Int) {}
+
+        val Int.extBar: Int get() = 1
+    }
+
+    class <caret>B {
+        fun test() {
+            1.extFoo(1.extBar)
+        }
+    }
+}

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelCompanionConflict/conflicts.txt

@@ -0,0 +1,2 @@
+Implicit companion object will be inaccessible: extBar
+Implicit companion object will be inaccessible: extFoo

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelCompanionConflict/nonInnerToTopLevelCompanionConflict.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "test.kt",
+  "type": "MOVE_KOTLIN_NESTED_CLASS",
+  "withRuntime": "true"
+}