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/VariableAsFunction1.kt

@@ -0,0 +1,13 @@
+fun String.foo(c: Char){}
+
+class C {
+    fun foo(i: Int){}
+
+    fun bar(foo: (String) -> Unit, p1: String, p2: Int, p3: Char) {
+        foo(<caret>)
+    }
+}
+
+// EXIST: p1
+// EXIST: p2
+// ABSENT: p3