Function delete 

pub async fn delete<'e, E, DB, D, Ex>(
    dialect: &D,
    executor: Ex,
    id: E::Id,
) -> Result<(), FletchError>
where
    E: Entity,
    D: Dialect,
    DB: Database + DatabaseBindable,
    Ex: Executor<'e, Database = DB> + Send,

Delete an entity by its primary key.