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/forLoopRange/ExtensionIteratorMethod.kt

@@ -0,0 +1,14 @@
+trait X
+trait Y
+
+fun X.iterator(): Y
+fun Y.next(): Int
+fun Y.hasNext(): Boolean
+
+
+fun foo(x: X, y: Y) {
+    for (i in <caret>)
+}
+
+// EXIST: x
+// ABSENT: y