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/functionReference/10.kt

@@ -0,0 +1,19 @@
+class C {
+    fun foo(s: String): Boolean = true
+
+    fun bar() {
+        listOf("a").filter(<caret>)
+    }
+
+    companion object {
+        fun staticFoo(s: String): Boolean = true
+    }
+}
+
+fun C.extensionFoo(s: String): Boolean = true
+fun globalFoo(s: String): Boolean = true
+
+// ABSENT: ::foo
+// ABSENT: ::staticFoo
+// ABSENT: ::extensionFoo
+// EXIST: ::globalFoo