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/generics/GenericFunction4.kt

@@ -0,0 +1,6 @@
+fun foo(list: List<String>): Collection<Int> {
+    return list.<caret>
+}
+
+// EXIST: { lookupString: "map", tailText: "(transform: (String) -> Int) for Iterable<T> in kotlin", typeText: "List<Int>" }
+// ABSENT: filter