Add support for Faults

[StefH]

#343

[codecov]

Codecov Report

Merging #360 into master will increase coverage by 0.27%.
The diff coverage is 83.6%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   80.66%   80.93%   +0.27%     
==========================================
  Files         115      117       +2     
  Lines        4602     4874     +272     
==========================================
+ Hits         3712     3945     +233     
- Misses        890      929      +39

Impacted Files	Coverage Δ
src/WireMock.Net/Admin/Mappings/FaultModel.cs	0% <0%> (ø)
src/WireMock.Net/Server/FluentMockServer.Admin.cs	70.51% <100%> (+6.28%)	⬆️
...ock.Net/Transformers/ResponseMessageTransformer.cs	98.16% <100%> (+0.03%)	⬆️
...rc/WireMock.Net/Owin/Mappers/OwinResponseMapper.cs	97.1% <100%> (+1.26%)	⬆️
src/WireMock.Net/ResponseMessage.cs	82.35% <100%> (+2.35%)	⬆️
...ireMock.Net/ResponseBuilders/Response.WithFault.cs	100% <100%> (ø)
src/WireMock.Net/Serialization/LogEntryMapper.cs	100% <100%> (ø)	⬆️
src/WireMock.Net/ResponseBuilders/Response.cs	95.21% <100%> (+0.02%)	⬆️
src/WireMock.Net/Admin/Mappings/ResponseModel.cs	100% <100%> (ø)	⬆️
...rc/WireMock.Net/Admin/Requests/LogResponseModel.cs	100% <100%> (ø)	⬆️
... and 10 more

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