chore(tests): introduce toxiproxy to integration tests

[iainsproat]

This PR introduces ToxiProxy to Docker Compose file for use in integration tests.

ToxiProxy can be used to simulate failures in a network.

The proxy can be controlled from tests by using the SDK for .Net

using (var connection = new Connection(true)) //this will ensure all proxies & toxics are reset on dispose.
{
  var client = connection.Client();
  var proxy = client.FindProxy("speckle_test_speckle-server");

  // do stuff with the proxy by adding toxics: e.g. latency, returning error status codes, or dropping the connection. In this example, causing a timeout.
  var timeoutProxy = new TimeoutToxic();
  timeoutProxy.Attributes.Timeout = 100;
  timeoutProxy.Toxicity = 1.0;
  proxy.Add(timeoutProxy);

  // then apply the changes
  proxy.Update();
  
  //now run your tests and experience timeout problems connecting to speckle server
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.95%. Comparing base (f408980) to head (dab0a26).
Report is 75 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev      #39       +/-   ##
===========================================
+ Coverage   27.48%   42.95%   +15.46%     
===========================================
  Files         375      394       +19     
  Lines       14535    15620     +1085     
  Branches     1404     1419       +15     
===========================================
+ Hits         3995     6709     +2714     
+ Misses      10267     8588     -1679     
- Partials      273      323       +50     

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[AlanRynne]

Closing this because we're not going to get around to this in the foreseeable future.

We'll pick this back up once we have some bandwidth! 🙌🏼