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/ExtendQualifiedClassName.kt

@@ -0,0 +1,16 @@
+package Test.SubTest.AnotherTest
+
+open class TestClass {
+}
+
+fun globalFun(){}
+val globalProp: Int = 1
+
+class A() : Test.SubTest.AnotherTest.<caret> {
+    public fun test() {
+    }
+}
+
+// EXIST: TestClass
+// ABSENT: globalFun
+// ABSENT: globalProp