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/java/ExtensionFromStandardLibrary.kt

@@ -0,0 +1,12 @@
+package first
+
+import java.util.ArrayList
+
+fun firstFun() {
+  val a = ArrayList<Int>()
+  a.toLinke<caret>
+}
+
+// INVOCATION_COUNT: 1
+// EXIST: { lookupString:"toLinkedList", itemText:"toLinkedList", tailText:"() for Iterable<T> in kotlin" }
+// NUMBER: 1