Extract Class: Implement 'Extract Superclass' refactoring

#KT-11017 In Progress

idea/testData/refactoring/extractSuperclass/addSuperclassPrimaryConstructor.kt.after

@@ -0,0 +1,13 @@
+// NAME: X
+interface T {}
+
+open class X {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}
+
+// SIBLING:
+class A(n: Int) : T, X() {
+}