Fixing Presence Conflicts (#3320)

This is meant to cache client presence for a moment so that it doesn't
oscillate.

Currently Dendrite just federates out whatever presence it gets from the
sync loop, which means if theres any clients attempting to sync without
setting the user online, and there is an online client, it will just
flip back and forth each time one of the clients polls /sync.

This pull request essentially stores in a map when the client last set
online ideally to allow the online client to sync again and set an
online presence before setting idle or offline.

I am not great at programming nor am I familiar with this codebase so if
this pr is just shitwater feel free to discard, just trying to fix an
issue that severely bothers me. If it is easier you can also steal the
code and write it in yourself. I ran the linter, not sure that it did
anything, the vscode go extension seems to format and lint anyways.

I tried to run unit tests but I have no idea any of this thing. it
errors on
`TestRequestPool_updatePresence/same_presence_is_not_published_dummy2
(10m0s)` which I think making this change broke. I am unsure how to
comply, if y'all point me in the right direction ill try to fix it. I
have tested it with all the situations I can think of on my personal
instance pain.agency, and this seems to stand up under all the
previously bugged situations.

~~My go also decided to update a bunch of the dependencies, I hate git
and github and have no idea how to fix that, it was not intentional.~~ i
just overwrote them with the ones from the main repo and committed it,
seems to have done what was needed.

### Pull Request Checklist

<!-- Please read
https://matrix-org.github.io/dendrite/development/contributing before
submitting your pull request -->

* [x] I have added Go unit tests or [Complement integration
tests](https://github.com/matrix-org/complement) for this PR _or_ I have
justified why this PR doesn't need tests
* [x] Pull request includes a [sign off below using a legally
identifiable
name](https://matrix-org.github.io/dendrite/development/contributing#sign-off)
_or_ I have already signed off privately

Signed-off-by: `Joseph Winkie <jjj333.p.1325@gmail.com>`

---------

Co-authored-by: Till Faelligen <2353100+S7evinK@users.noreply.github.com>

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