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/TopLevelClassCompletionInQualifiedCall.kt

@@ -0,0 +1,13 @@
+class Test {
+    fun foo(a: Collection<String>) {
+
+    }
+}
+
+fun test() {
+    val t = Test()
+    t.foo(Array<caret>)
+}
+
+// EXIST: ArrayList
+// INVOCATION_COUNT: 2