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/basic/common/InFunctionArguments.kt

@@ -0,0 +1,14 @@
+class Foo {
+    fun add(a: Any) {}
+}
+
+
+fun test() {
+    val foo = Foo()
+    foo.add(AL<caret>)
+}
+
+/* For KT-3779, KT-2821 */
+
+// INVOCATION_COUNT: 2
+// EXIST: ArrayList