Created module idea-test-framework and moved classes needed for idea tests there

Moved tests for completion and their test data into module idea-completion

idea/idea-completion/testData/smart/functionReference/12.kt

@@ -0,0 +1,13 @@
+class C {
+    fun foo(p: C.() -> Unit){}
+
+    fun bar() {
+        foo(<caret>)
+    }
+
+    fun f1(){}
+    fun C.f2(){}
+}
+
+// EXIST: ::f1
+// ABSENT: ::f2