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/StandardJetArrayFirst.kt

@@ -0,0 +1,15 @@
+fun main(args: Array<String>) {
+    Array<caret>
+}
+
+// INVOCATION_COUNT: 2
+// WITH_ORDER: true
+// EXIST: { lookupString:"Array", tailText:"<T> (kotlin)" }
+// EXIST_JAVA_ONLY: { lookupString:"Array", tailText:" (java.sql)" }
+// EXIST: { lookupString:"ArrayList", tailText:"<E> (java.util)" }
+
+
+
+
+
+// Developer! Every ancient failure of this test is important!