Support Path in ProxyUrl

[StefH]

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[codecov]

Codecov Report

Merging #461 into master will increase coverage by 0.01%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #461      +/-   ##
==========================================
+ Coverage   75.69%   75.70%   +0.01%     
==========================================
  Files         130      130              
  Lines        5035     5042       +7     
  Branches      495      496       +1     
==========================================
+ Hits         3811     3817       +6     
  Misses       1078     1078              
- Partials      146      147       +1     

Impacted Files	Coverage Δ
src/WireMock.Net/ResponseBuilders/Response.cs	95.09% <87.50%> (-0.41%)	⬇️
...Net.Abstractions/Admin/Requests/LogRequestModel.cs	100.00% <100.00%> (ø)
src/WireMock.Net/RequestMessage.cs	90.16% <100.00%> (+0.16%)	⬆️
src/WireMock.Net/Serialization/LogEntryMapper.cs	100.00% <100.00%> (ø)

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