Use macros for creating the intermediate stage.

This is to make it easier to change function signatures by consolidating the places where the signatures exist.

src/intermediate/entity.rs

@@ -1,19 +1,14 @@
-use crate::error::CustomError;
-
+use super::macros::intermediate;
 use super::registry::Registry;
+use crate::error::CustomError;
 
 #[derive(Debug, Clone)]
 pub(crate) struct IEntity {
     pub(crate) html: String,
 }
 
-impl IEntity {
-    pub(crate) async fn new<'b, 'parse>(
-        registry: &'b mut Registry<'parse>,
-        original: &'b organic::types::Entity<'parse>,
-    ) -> Result<IEntity, CustomError> {
-        Ok(IEntity {
-            html: original.html.to_owned(),
-        })
-    }
-}
+intermediate!(IEntity, Entity, |registry, original| async {
+    Ok(IEntity {
+        html: original.html.to_owned(),
+    })
+});