Support composite IDs

Rails 7 supports composite primary keys, which means we need to pull the ID param with `extract_value`.

lib/implicit_resource.rb

@@ -35,7 +35,7 @@ def collection
 
   def resource
     @resource ||= if params[:id].present?
-      collection.find(params[:id])
+      collection.find(params.extract_value(:id))
     else
       collection.new
     end