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/NoPrivateOverload.kt

@@ -0,0 +1,15 @@
+fun f(p1: Any, p2: String, p3: Int) {
+    C().foo(<caret>)
+}
+
+class C {
+    public fun foo(p1: String, p2: Any) {
+    }
+
+    private fun foo(p1: Int) {
+    }
+}
+
+// ABSENT: p1
+// EXIST: p2
+// ABSENT: p3