Creates a Marmot v2 group seeded with the default group components: a
group.profile.v1 (name + description), an admin-policy.v1 (the creator
plus any extra admins), and — when relays are supplied — a
transport.nostr.routing.v1 carrying a fresh nostr group id and the relays.
Creates a Marmot v2 group seeded with the default group components: a
group.profile.v1(name + description), anadmin-policy.v1(the creator plus any extra admins), and — when relays are supplied — atransport.nostr.routing.v1carrying a fresh nostr group id and the relays.