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/OnlyScopedClassesWithoutExplicit.kt

@@ -0,0 +1,9 @@
+package first
+
+fun firstFun() {
+  val a = In<caret>
+}
+
+// INVOCATION_COUNT: 0
+// EXIST: { lookupString:"Int", tailText:" (kotlin)" }
+// ABSENT: { lookupString:"IntRef", tailText:" (kotlin.internal.Ref)" }