Enh: New event feed and websocket endpoint. Resolves OP-1891

[rakuy0]

Should leave enough foundation to add more events in the future as well.

[codecov]

Codecov Report

Base: 97.15% // Head: 97.05% // Decreases project coverage by -0.09% ⚠️

Coverage data is based on head (ff57a08) compared to base (c77c9d3).
Patch coverage: 97.54% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2851      +/-   ##
==========================================
- Coverage   97.15%   97.05%   -0.10%     
==========================================
  Files         214      214              
  Lines       41624    41737     +113     
==========================================
+ Hits        40439    40508      +69     
- Misses       1185     1229      +44     

Flag	Coverage Δ
linux	97.05% <97.54%> (-0.01%)	⬇️
linux_replay	?

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

Impacted Files	Coverage Δ
synapse/lib/httpapi.py	96.22% <90.00%> (-0.28%)	⬇️
synapse/lib/hiveauth.py	95.95% <98.14%> (-0.28%)	⬇️
synapse/cortex.py	96.71% <100.00%> (-0.55%)	⬇️
synapse/lib/cell.py	97.84% <100.00%> (+0.09%)	⬆️
synapse/lib/layer.py	96.99% <100.00%> (-0.04%)	⬇️
synapse/lib/view.py	97.00% <100.00%> (-0.32%)	⬇️
synapse/tests/utils.py	94.41% <0.00%> (-1.83%)	⬇️
synapse/lib/trigger.py	94.98% <0.00%> (-0.39%)	⬇️
... and 14 more

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[invisig0th]

Love the name of this subsystem and the clean implementation. Couple clarifications. :D

[vEpiphyte]

Rakuyo is still updating this, holding for next release.