Add cancellation tests

[adamhathcock]

requires #216

[codecov]

Codecov Report

Attention: Patch coverage is 88.84540% with 57 lines in your changes missing coverage. Please review.

Project coverage is 70.62%. Comparing base (f0c7169) to head (d1350d5).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
...Sdk.Serialization.Tests/Framework/TestTransport.cs	20.00%	8 Missing ⚠️
...peckle.Sdk/Serialisation/V2/Send/BaseSerializer.cs	80.00%	5 Missing and 1 partial ⚠️
...zation.Tests/DummyCancellationSqLiteSendManager.cs	25.00%	6 Missing ⚠️
...k.Serialization.Tests/Framework/TestFileManager.cs	77.77%	3 Missing and 3 partials ⚠️
...zation.Tests/CancellationSqLiteJsonCacheManager.cs	73.33%	4 Missing ⚠️
Speckle.Sdk.Testing/Framework/ExceptionScrubber.cs	75.00%	2 Missing and 1 partial ⚠️
...c/Speckle.Sdk/Api/Operations/Operations.Receive.cs	0.00%	3 Missing ⚠️
.../Speckle.Sdk.Serialization.Tests/ExceptionTests.cs	93.02%	0 Missing and 3 partials ⚠️
...ation.Tests/Framework/ExceptionSendCacheManager.cs	66.66%	3 Missing ⚠️
...e.Sdk/Serialisation/V2/Receive/BaseDeserializer.cs	60.00%	1 Missing and 1 partial ⚠️
... and 10 more

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #218       +/-   ##
===========================================
+ Coverage   58.07%   70.62%   +12.55%     
===========================================
  Files         251      278       +27     
  Lines       10083    11120     +1037     
  Branches     1089     1102       +13     
===========================================
+ Hits         5856     7854     +1998     
+ Misses       3971     2914     -1057     
- Partials      256      352       +96     

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