This introduces a flag to configure whether `Messenger.CreateCommunity`
should create a default channel.
As discussed in https://github.com/status-im/status-go/issues/2758, this
is needed for the upcoming functionality to import discord communities.
Closes#2758
We periodically check whether we should backup contacts through waku.
Currently it's not tied to any event, it will only schedule a backup on
a tick, or through the provided API endpoint.