Add setting to handle requests synchronously

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #496 into master will decrease coverage by 0.09%.
The diff coverage is 43.47%.

@@            Coverage Diff             @@
##           master     #496      +/-   ##
==========================================
- Coverage   76.15%   76.06%   -0.10%     
==========================================
  Files         136      136              
  Lines        5180     5197      +17     
  Branches      508      510       +2     
==========================================
+ Hits         3945     3953       +8     
- Misses       1084     1091       +7     
- Partials      151      153       +2     

Impacted Files	Coverage Δ
src/WireMock.Net/Server/FluentMockServer.cs	0.00% <0.00%> (ø)
...rc/WireMock.Net/Settings/WireMockServerSettings.cs	64.00% <0.00%> (-2.67%)	⬇️
...eMock.Net/Settings/WireMockServerSettingsParser.cs	0.00% <0.00%> (ø)
src/WireMock.Net/Server/WireMockServer.Admin.cs	56.50% <33.33%> (-0.28%)	⬇️
src/WireMock.Net/Owin/WireMockMiddleware.cs	91.22% <62.50%> (-4.78%)	⬇️
...k.Net.Abstractions/Admin/Settings/SettingsModel.cs	100.00% <100.00%> (ø)
src/WireMock.Net/Owin/WireMockMiddlewareOptions.cs	88.23% <100.00%> (+0.73%)	⬆️
src/WireMock.Net/Server/WireMockServer.cs	72.68% <100.00%> (+0.11%)	⬆️

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