Macro impl_clean_debug 

macro_rules! impl_clean_debug {
    ($error:ty, [ $( $cause:ty ),* $(,)? ]) => { ... };
}

Generate the clean Debug, a clean_string helper and a crate-local cause resolver for an error type.

The list is every error type that can appear in the cause chain (this type plus every BackendError it can wrap); order is irrelevant.

headless_lms_base::impl_clean_debug!(ChatbotError, [ChatbotError, ModelError, UtilError]);