slog mains

[brianolson]

add integration into main()s for slog, set level, output file, log rotation rules, text or json

stack on bluesky-social#858

[bnewbold]

I feel a bit meh about adding logrotate and other complex stuff like that. do we use any go-log functionality other than setting the log level, anywhere in our stack? I think we basically log out to stdout/stderr everywhere, and use other daemons/systems to manage the stream of logs (eg, implement log rotation, shipping to relevant log indexing services, etc).

but I care more about getting the log/slog refactor merged than I do nit-picking around log infra generally.

[brianolson]

relay works better logging directly to file and the rotation stuff has been exercised in recent gigarelay experiments

[brianolson]

this is replaced by bluesky-social#866 which is the same stuff but against main after bluesky-social#856 has merged

[brianolson]

merged as bluesky-social#866