app service unix socket support

[cyberb]

This is the last part of unix socket support to talk to app servers, go based app services already support unix sockets:
mautrix/go@5a68173

appservice:
  # The address that the homeserver can use to connect to this appservice.
  address: unix:///var/snap/matrix/current/whatsapp.socket

  # The hostname and port where this appservice should listen.
  hostname: /var/snap/matrix/current/whatsapp.socket
  port: 0

Pull Request Checklist

• I have added Go unit tests or Complement integration tests for this PR or I have justified why this PR doesn't need tests
• Pull request includes a sign off below using a legally identifiable name or I have already signed off privately

Signed-off-by: Boris Rybalkin <ribalkin@gmail.com>

[codecov]

Codecov Report

Patch coverage: 79.54% and project coverage change: -0.15 ⚠️

Comparison is base (682a7d0) 66.75% compared to head (40d04c5) 66.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3022      +/-   ##
==========================================
- Coverage   66.75%   66.60%   -0.15%     
==========================================
  Files         495      495              
  Lines       53532    53548      +16     
==========================================
- Hits        35736    35668      -68     
- Misses      14197    14263      +66     
- Partials     3599     3617      +18     

Flag	Coverage Δ
unittests	46.21% <79.54%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
appservice/query/query.go	65.15% <60.00%> (ø)
appservice/consumers/roomserver.go	64.73% <66.66%> (-0.21%)	⬇️
setup/config/config_appservice.go	66.35% <86.20%> (+2.67%)	⬆️
appservice/appservice.go	78.43% <100.00%> (-3.54%)	⬇️

... and 22 files with indirect coverage changes

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[cyberb]

is it possible to review this branch as I need to rebase every few days now?

[S7evinK]

Needs a few more tests to check that we can connect to an appservice using unix sockets.
Probably TestAppserviceInternalAPI can be copied and changed to listen on a unix socket instead of a HTTP server.

Otherwise looks sane to me.

[cyberb]

@S7evinK could you check please?

[cyberb]

can someone check this?

[S7evinK]

Thanks for this!

[cyberb]

Thank you very much for the great support!