refactor: Let serde serialize Add Series and Add Movie enums instead of calling to_string up front

src/cli/radarr/add_command_handler.rs

@@ -122,12 +122,12 @@ impl<'a, 'b> CliCommandHandler<'a, 'b, RadarrAddCommand> for RadarrAddCommandHan
           title: String::new(),
           root_folder_path,
           quality_profile_id,
-          minimum_availability: minimum_availability.to_string(),
+          minimum_availability,
           monitored: !disable_monitoring,
           tags,
           tag_input_string: None,
           add_options: AddMovieOptions {
-            monitor: monitor.to_string(),
+            monitor,
             search_for_movie: !no_search_for_movie,
           },
         };

src/cli/radarr/add_command_handler_tests.rs

@@ -384,12 +384,12 @@ mod tests {
         title: String::new(),
         root_folder_path: "/test".to_owned(),
         quality_profile_id: 1,
-        minimum_availability: "released".to_owned(),
+        minimum_availability: MinimumAvailability::Released,
         monitored: false,
         tags: vec![1, 2],
         tag_input_string: None,
         add_options: AddMovieOptions {
-          monitor: "movieAndCollection".to_owned(),
+          monitor: MovieMonitor::MovieAndCollection,
           search_for_movie: false,
         },
       };