KT-15320 Live templates: please add function which returns the "outer" class name

idea/idea-live-templates/testData/soutf_InCompanion.exp.kt

@@ -0,0 +1,7 @@
+class Test() {
+    companion object {
+        fun test() {
+            println("Test.test")<caret>
+        }
+    }
+}