message: Add missing `Debug` impl on generated reactor error
diff: @@ -95,6 +95,7 @@ pub(crate) fn generate_reactor_types(def: &ReactorDefinition) -> TokenStream {
  #(#event_variants,)*
  }
  + #[derive(Debug)]
  pub enum #error_ident {
  #(#error_variants,)*
  MetricsInitialization(prometheus::Error),
  