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 71.92%. Comparing base (f6d6951) to head (c29c8c3).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #941      +/-   ##
==========================================
- Coverage   71.95%   71.92%   -0.03%     
==========================================
  Files           7        7              
  Lines         599      602       +3     
==========================================
+ Hits          431      433       +2     
- Misses        168      169       +1     

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