Extract Superclass/Interface: Allow extracting class with special name (and quotes)

#KT-15353 Fixed

idea/testData/refactoring/extractInterface/specialName.kt

@@ -0,0 +1,8 @@
+// NAME: class
+// SIBLING:
+class <caret>A {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/specialName.kt.after

@@ -0,0 +1,11 @@
+interface `class` {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}
+
+// NAME: class
+// SIBLING:
+class A : `class` {
+}