Add support for AzureAD authentication for REST admin interface

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #637 (01533a0) into master (57cc616) will decrease coverage by 0.19%.
The diff coverage is 53.70%.

@@            Coverage Diff             @@
##           master     #637      +/-   ##
==========================================
- Coverage   74.65%   74.45%   -0.20%     
==========================================
  Files         141      143       +2     
  Lines        5934     5982      +48     
  Branches      635      636       +1     
==========================================
+ Hits         4430     4454      +24     
- Misses       1302     1326      +24     
  Partials      202      202              

Impacted Files	Coverage Δ
...eMock.Net/Settings/WireMockServerSettingsParser.cs	0.00% <0.00%> (ø)
...Net/Authentication/AzureADAuthenticationMatcher.cs	24.13% <24.13%> (ø)
src/WireMock.Net/Owin/WireMockMiddleware.cs	90.56% <50.00%> (ø)
...k.Net/Authentication/BasicAuthenticationMatcher.cs	100.00% <100.00%> (ø)
src/WireMock.Net/Owin/WireMockMiddlewareOptions.cs	72.00% <100.00%> (ø)
src/WireMock.Net/Server/WireMockServer.cs	65.21% <100.00%> (+1.13%)	⬆️
...rc/WireMock.Net/Settings/WireMockServerSettings.cs	96.87% <100.00%> (+0.20%)	⬆️

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