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/NoNestedClassAfterReceiver.kt

@@ -0,0 +1,13 @@
+class C {
+    class Nested
+    inner class Inner1
+    inner class Inner2(s: String)
+}
+
+fun foo(c: C) {
+    c.<caret>
+}
+
+// ABSENT: Nested
+// EXIST: { lookupString: "Inner1", itemText: "Inner1", tailText: "()", typeText: "C.Inner1" }
+// EXIST: { lookupString: "Inner2", itemText: "Inner2", tailText: "(s: String)", typeText: "C.Inner2" }