Add TimeSettings (Start, End and TTL)

[StefH]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@7ca2095). Click here to learn what that means.
The diff coverage is 43.85%.

@@            Coverage Diff            @@
##             master     #661   +/-   ##
=========================================
  Coverage          ?   74.17%           
=========================================
  Files             ?      146           
  Lines             ?     6040           
  Branches          ?      644           
=========================================
  Hits              ?     4480           
  Misses            ?     1356           
  Partials          ?      204           

Impacted Files	Coverage Δ
src/WireMock.Net/Extensions/AnyOfExtensions.cs	100.00% <ø> (ø)
src/WireMock.Net/Server/WireMockServer.Admin.cs	55.03% <0.00%> (ø)
src/WireMock.Net/Server/WireMockServer.cs	65.21% <ø> (ø)
.../WireMock.Net/Extensions/TimeSettingsExtensions.cs	21.05% <21.05%> (ø)
src/WireMock.Net/Server/RespondWithAProvider.cs	88.18% <28.57%> (ø)
...c/WireMock.Net/Serialization/TimeSettingsMapper.cs	50.00% <50.00%> (ø)
src/WireMock.Net/Mapping.cs	98.27% <100.00%> (ø)
src/WireMock.Net/Models/TimeSettings.cs	100.00% <100.00%> (ø)
src/WireMock.Net/Owin/MappingMatcher.cs	100.00% <100.00%> (ø)
src/WireMock.Net/Proxy/ProxyHelper.cs	91.07% <100.00%> (ø)
... and 1 more

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