Allow deleting multiple objects that are Identifiable (e.g. Vec<I: Identifiable>) directly

[MrMuetze]

Hi everyone,
I think it would be nice if I could delete e.g. a vector of objects that implement Identifiable directly. This would remove the need of collecting the ids (i.e. primary keys) first and putting them into a filter(id.eq_any(ids)) statement.

Best regards!