git-ref-format: qualified macro

Add a `qualified!` macro to the set of git-ref-format macros. This
allows the construction of a `refs/<cat>/<name>` reference from a
string literal.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>

git-ref-format/t/src/tests.rs

@@ -1,13 +1,28 @@
 // Copyright © 2022 The Radicle Link Contributors
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-use git_ref_format::{component, name, refname, refspec, Error, Qualified, RefStr, RefString};
+use git_ref_format::{
+    component,
+    name,
+    qualified,
+    refname,
+    refspec,
+    Error,
+    Qualified,
+    RefStr,
+    RefString,
+};
 
 #[test]
 fn refname_macro_works() {
     assert_eq!("refs/heads/main", refname!("refs/heads/main").as_str())
 }
 
+#[test]
+fn qualified_macro_works() {
+    assert_eq!("refs/heads/main", qualified!("refs/heads/main").as_str())
+}
+
 #[test]
 fn component_macro_works() {
     assert_eq!("self", name::component!("self").as_str())