Add sticky event parsing

[turt2live]

MSC: matrix-org/matrix-spec-proposals#4354

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.83%. Comparing base (6697d93) to head (a57436b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
+ Coverage   53.43%   53.83%   +0.40%     
==========================================
  Files          52       52              
  Lines        7842     7870      +28     
==========================================
+ Hits         4190     4237      +47     
+ Misses       3247     3223      -24     
- Partials      405      410       +5     

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