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If multi-relay onboarding config is set from UIs, automatically add relays until there are 3 relays. For now, there will be a hardcoded list of relay candidates. - We need a list of chatmail relays that we somehow trust, and that agree to be in the list. Then, we add all of them to the candidate list (a new SQL table with colums "host" and "last_tried"). - Before going to IMAP IDLE: When there are less than 3 relays, fill it up with relays from the candidate list. If creating an account fails, try again with another relay from the list. For each candidate, we need to remember the last time we tried to add a transport there, and try at most once a week or so per candidate. - For now, this will be behind an off-by-default config option, which at least DC Android will enable when creating a new profile. UIs can then opt in on their own pace but will likely need to disable it for tests. - Right now, the backoff times are: Try to add a relay at most once per hour, and try to add the same relay at most once per week