Copy: Support class copying

#KT-8180 Fixed
 #KT-9054 Fixed

idea/testData/refactoring/copy/copyClassWithCompanionRefs/after/bar/A.kt

@@ -0,0 +1,15 @@
+package bar
+
+class A {
+    fun test() {
+        A.testCompanion()
+        testCompanion()
+        Companion.testCompanion()
+    }
+
+    companion object {
+        fun testCompanion() {
+
+        }
+    }
+}

idea/testData/refactoring/copy/copyClassWithCompanionRefs/after/foo/test.kt

@@ -0,0 +1,15 @@
+package foo
+
+class A {
+    fun test() {
+        A.testCompanion()
+        testCompanion()
+        Companion.testCompanion()
+    }
+
+    companion object {
+        fun testCompanion() {
+
+        }
+    }
+}

idea/testData/refactoring/copy/copyClassWithCompanionRefs/before/foo/test.kt

@@ -0,0 +1,15 @@
+package foo
+
+class <caret>A {
+    fun test() {
+        A.testCompanion()
+        testCompanion()
+        Companion.testCompanion()
+    }
+
+    companion object {
+        fun testCompanion() {
+
+        }
+    }
+}

idea/testData/refactoring/copy/copyClassWithCompanionRefs/copyClassWithCompanionRefs.test

@@ -0,0 +1,4 @@
+{
+  "mainFile": "foo/test.kt",
+  "targetPackage": "bar"
+}