Record topic setter + set-time so 333 reports the truth

RPL_TOPICWHOTIME (333) was emitted on JOIN with the *joiner's*
nick as the setter and System/currentTimeMillis as the set-time —
neither of which has any relationship to who actually set the
topic when.

Add :papod.channel/topic-set-by (string) and :papod.channel/topic-
set-at (long unix seconds) to the schema, populate them in the
TOPIC handler, and read them in join-one!'s 333 emission (falling
back to nick / now if absent, e.g. an empty channel snapshot
imported without the new attrs).

Surfaced by the chat.papo.im differential test (333 line diverged
between fake-ircd's correctly-tracked setter and papod's broken
output).

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