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/handlers/ClassFromClassObjectInPackage.kt

@@ -0,0 +1,11 @@
+package a
+
+class Test {
+    companion object {
+        class Some
+    }
+}
+
+fun test() {
+    a.Test.Companion.S<caret>
+}