Add webhooks for PeerConnected and PeerDisconnected events

[codecov[bot]]

Codecov Report

Merging #104 (6165296) into main (aa75980) will increase coverage by 0.42%. The diff coverage is 91.37%.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   85.30%   85.73%   +0.42%     
==========================================
  Files          44       46       +2     
  Lines         796      834      +38     
==========================================
+ Hits          679      715      +36     
- Misses        117      119       +2     

Files	Coverage Δ
lib/jellyfish/application.ex	47.82% <ø> (ø)
lib/jellyfish/event.ex	85.71% <100.00%> (+2.38%)	:arrow_up:
lib/jellyfish/metrics_scraper.ex	61.29% <100.00%> (ø)
lib/jellyfish_web/api_spec/room.ex	100.00% <ø> (ø)
lib/jellyfish_web/controllers/room_controller.ex	100.00% <100.00%> (ø)
lib/jellyfish_web/peer_socket.ex	88.09% <100.00%> (-0.55%)	:arrow_down:
test/support/webhook_plug.ex	100.00% <100.00%> (ø)
test/support/ws.ex	93.33% <100.00%> (+1.02%)	:arrow_up:
lib/jellyfish/room_service.ex	86.41% <92.85%> (+1.08%)	:arrow_up:
lib/jellyfish/room.ex	84.55% <60.00%> (+0.11%)	:arrow_up:
... and 1 more

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