Idea: hosted DB snapshots

[jeluard]

Provide a DB snapshotting service that allows to download amaru DB snapshots per unit of time (e.g. epoch).
This could also be an opportunity to initiate discussion with mithril to eventually have those snapshots mithril signed.

See https://github.com/ethpandaops/snapshotter and https://ethpandaops.io/data/snapshots/