Feature/lapp 15 Mock HttpClient

[cgalan-applaudo]

Using a Mock instead to make a real Http request for unit tests

[codecov-io]

Codecov Report

Merging #111 into master will decrease coverage by 1.23%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   84.32%   83.09%   -1.24%     
==========================================
  Files          32       32              
  Lines         587      621      +34     
==========================================
+ Hits          495      516      +21     
- Misses         92      105      +13

Impacted Files	Coverage Δ
...etStandard20/Request/BlockingRequestHandlerTest.cs	80.64% <ø> (ø)	⬆️
Test.NetStandard20/ConnectionTests.cs	100% <100%> (ø)	⬆️
Analytics/Client.cs	60% <100%> (+0.57%)	⬆️
Test.NetStandard20/ActionTests.cs	100% <100%> (ø)	⬆️
Analytics/Analytics.cs	62.5% <100%> (-37.5%)	⬇️
Test.NetStandard20/FlushTests.cs	92.3% <100%> (-2.82%)	⬇️
Analytics/Request/BlockingRequestHandler.cs	76.92% <0%> (-5.5%)	⬇️

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[cgalan-applaudo]

This PR was included on #112