Introduce Event aggregator

[adamhathcock]

Decouples exception handler from browser bridge.
IdleManager is now a OneTime event with IDs.
Rhino is converted.
Global Events (Doc changed) are converted.

More events to come!

[codecov]

Codecov Report

Attention: Patch coverage is 18.55204% with 180 lines in your changes missing coverage. Please review.

Project coverage is 8.71%. Comparing base (4b24584) to head (bda6abe).
Report is 10 commits behind head on remove-dataflow.

Files with missing lines	Patch %	Lines
...eckle.Connectors.DUI/Eventing/EventSubscription.cs	0.00%	34 Missing ⚠️
DUI3/Speckle.Connectors.DUI/Eventing/EventBase.cs	26.31%	28 Missing ⚠️
...UI3/Speckle.Connectors.DUI/Bridge/BrowserBridge.cs	0.00%	25 Missing ⚠️
...eckle.Connectors.DUI/Eventing/DelegateReference.cs	0.00%	23 Missing ⚠️
...UI3/Speckle.Connectors.DUI/Eventing/PubSubEvent.cs	5.00%	19 Missing ⚠️
...I3/Speckle.Connectors.DUI/Eventing/SpeckleEvent.cs	5.26%	18 Missing ⚠️
...eckle.Connectors.DUI/Eventing/SubscriptionToken.cs	0.00%	14 Missing ⚠️
....Connectors.DUI/Eventing/SpeckleEventAggregator.cs	0.00%	8 Missing ⚠️
...I3/Speckle.Connectors.DUI/ContainerRegistration.cs	0.00%	3 Missing ⚠️
...onnectors.DUI/Bindings/OperationProgressManager.cs	0.00%	2 Missing ⚠️
... and 4 more

Additional details and impacted files

@@                Coverage Diff                 @@
##           remove-dataflow    #417      +/-   ##
==================================================
- Coverage             9.07%   8.71%   -0.37%     
==================================================
  Files                  228     238      +10     
  Lines                 4340    4475     +135     
  Branches               522     558      +36     
==================================================
- Hits                   394     390       -4     
- Misses                3930    4070     +140     
+ Partials                16      15       -1     

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