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/visibility/VisibilityInSubclassForce.kt

@@ -0,0 +1,15 @@
+class Some() {
+    public val testPublic = 12
+    protected val testProtected = 12
+    private val testPrivate = 12
+    val testPackage = 12
+}
+
+class SomeSubclass : Some() {
+    fun test() {
+        <caret>
+    }
+}
+
+// INVOCATION_COUNT: 2
+// EXIST: testPublic, testProtected, testPackage, testPrivate