Timing object updates

[salmoro]

1. Make updateTimingObject of TimingSrcConnector to be more atomic to increase the accuracy of the player state snapshot captured when updating the TimingObject.
2. Use Typescript types for TimingObject from https://github.com/chrisguttandin/timing-object instead of declaring in our codebase so that if one uses both packages they're less likely to run into type-related issues.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.14%. Comparing base (af0a78c) to head (537f385).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #941      +/-   ##
==========================================
+ Coverage   72.00%   72.14%   +0.14%     
==========================================
  Files           7        7              
  Lines         575      578       +3     
==========================================
+ Hits          414      417       +3     
  Misses        161      161              

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