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/InsideAnonymousClass.kt

@@ -0,0 +1,14 @@
+class A(private val xxx1: Int, val xxx2: Int) {
+    private val xxx3: Int = 0
+
+    private val x = object : Runnable {
+        override fun run() {
+            <caret>
+        }
+    }
+}
+
+// EXIST: xxx1
+// EXIST: xxx2
+// EXIST: xxx3
+// EXIST: x