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/GenericFunction1.kt

@@ -0,0 +1,8 @@
+fun foo(array: Array<String>){}
+
+fun f(){
+    foo(<caret>)
+}
+
+// EXIST: { lookupString: "array", tailText: "(vararg t: String) (kotlin)", typeText: "Array<String>" }
+// ABSENT: arrayOfNulls