Add WebProxySettings (use when proxying requests)

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #370 into master will decrease coverage by 0.35%.
The diff coverage is 53.94%.

@@           Coverage Diff            @@
##           master   #370      +/-   ##
========================================
- Coverage   80.35%    80%   -0.36%     
========================================
  Files         118    121       +3     
  Lines        4730   4782      +52     
========================================
+ Hits         3801   3826      +25     
- Misses        929    956      +27

Impacted Files	Coverage Δ
src/WireMock.Net/ResponseBuilders/Response.cs	96.96% <ø> (+1.7%)	⬆️
src/WireMock.Net.StandAlone/StandAloneApp.cs	0% <0%> (ø)	⬆️
src/WireMock.Net/Admin/Mappings/WebProxyModel.cs	0% <0%> (ø)
src/WireMock.Net/Settings/WebProxySettings.cs	100% <100%> (ø)
...ireMock.Net/ResponseBuilders/Response.WithProxy.cs	100% <100%> (ø)
...rc/WireMock.Net/Settings/ProxyAndRecordSettings.cs	100% <100%> (ø)	⬆️
src/WireMock.Net/Admin/Mappings/ResponseModel.cs	100% <100%> (ø)	⬆️
src/WireMock.Net/Serialization/MappingConverter.cs	68.26% <38.46%> (-3.72%)	⬇️
src/WireMock.Net/Server/FluentMockServer.Admin.cs	61.22% <8.33%> (-0.82%)	⬇️
src/WireMock.Net/Http/HttpClientHelper.cs	86.48% <91.66%> (+4.34%)	⬆️
... and 3 more

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