#[derive_group]Expand description
A proc macro unrelated to adt-into: it is useful in hax
and we don’t want a whole crate only for that helper.
This proc macro defines some groups of derive clauses that
we reuse all the time. This is particularly interesting for
serializers and deserializers: today we use bincode and
serde, but maybe we will want to move to something else
in the future.