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/inOperator/NonBooleanContains.kt

@@ -0,0 +1,9 @@
+trait X {
+    fun contains(s: String): Boolean?
+}
+
+fun foo(s: String, x: X) {
+    if (s in <caret>)
+}
+
+// ABSENT: x