replace sled with other databases

[meypod]

Hi as you may be aware, or not, sled is not a reliable DB at the moment: https://github.com/spacejam/sled/issues https://gitlab.com/famedly/conduit/-/issues/74 https://github.com/subconsciousnetwork/noosphere/issues/607

and the rewrite seems to be slow: https://github.com/komora-io/marble

so to me it makes sense to move away from sled as soon as possible

it would be nice if we could easily swap the db with the db of our choice, for example what I have in mind is ScyllaDB