irc: versionadded notes + Optional annotation migration
#2642
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Description
This takes care of #2602 as far as what directly prompted me to slot it into the 8.0.1 milestone, with new
versionaddedannotations in the docstrings of stuff that's new-ish (added in 7.x or later). I figure after this PR, that issue can become a general checklist of which submodules have been looked at again since 8.0.0 and live un-milestoned for a while.Maybe we should also have a tracking issue for the second half of this PR, which starts the process of something we talked about in other patches: Replacing use of
typing.Optionalwith| None. Right now I think "just migrate the files you touch" is better than a "touch ALL the things!" PR, but we still should keep track of what's been done.Checklist
make qa(runsmake lintandmake test)make lintonly locally, as no runtime code is touched