Replace ruma_identifiers_macros::device_id with ruma_identifiers::device_id

The proc_macro is replaced by a macro_rules macro because it doesn't
actually need and proc_macro features.

ruma-identifiers-macros/src/lib.rs

@@ -7,16 +7,6 @@ use ruma_identifiers_validation::{
 };
 use syn::{parse_macro_input, LitStr};
 
-#[proc_macro]
-pub fn device_id(input: TokenStream) -> TokenStream {
-    let id = parse_macro_input!(input as LitStr);
-    let output = quote! {
-        ::std::boxed::Box<::ruma::identifiers::DeviceId>::from(#id)
-    };
-
-    output.into()
-}
-
 #[proc_macro]
 pub fn device_key_id(input: TokenStream) -> TokenStream {
     let id = parse_macro_input!(input as LitStr);

ruma-identifiers/src/lib.rs

@@ -73,3 +73,11 @@ where
         T::try_from(&v).map_err(|_| de::Error::invalid_value(Unexpected::Str(&v), &expected_str))
     })
 }
+
+/// Shorthand for `Box::<DeviceId>::from`.
+#[macro_export]
+macro_rules! device_id {
+    ($s:tt) => {
+        ::std::boxed::Box<$crate::DeviceId>::from($s)
+    };
+}