Add codegen box test templates for identifiers

compiler/tests-spec/testData/codegen/box/templates/identifiers/fileAnnotationSimple.kt

@@ -0,0 +1,18 @@
+<!DIRECTIVES("HELPERS: REFLECT")!>
+
+@file:<!ELEMENT(1)!>
+@file:<!ELEMENT(2)!>
+
+@Target(AnnotationTarget.FILE)
+annotation class <!ELEMENT(1)!>
+
+@Target(AnnotationTarget.FILE)
+annotation class <!ELEMENT(2)!>
+
+fun box(): String? {
+    if (!checkFileAnnotations("<!CLASS_OF_FILE!>", listOf("<!ELEMENT_VALIDATION(1)!>", "<!ELEMENT_VALIDATION(2)!>"))) return null
+    if (!checkClassName(<!ELEMENT(1)!>::class, "<!ELEMENT_VALIDATION(1)!>")) return null
+    if (!checkClassName(<!ELEMENT(2)!>::class, "<!ELEMENT_VALIDATION(2)!>")) return null
+
+    return "OK"
+}