Add MatchOperator "Or", "And" and "Average" for patterns

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #755 (3e69164) into master (1f23022) will increase coverage by 0.01%.
The diff coverage is 79.52%.

@@            Coverage Diff             @@
##           master     #755      +/-   ##
==========================================
+ Coverage   72.79%   72.81%   +0.01%     
==========================================
  Files         195      200       +5     
  Lines        6955     7135     +180     
  Branches      729      743      +14     
==========================================
+ Hits         5063     5195     +132     
- Misses       1673     1718      +45     
- Partials      219      222       +3     

Impacted Files	Coverage Δ
...k.Net.Abstractions/Admin/Mappings/ClientIPModel.cs	0.00% <0.00%> (ø)
...reMock.Net.Abstractions/Admin/Mappings/UrlModel.cs	0.00% <0.00%> (ø)
src/WireMock.Net/Server/WireMockServer.cs	65.23% <26.31%> (-2.85%)	⬇️
src/WireMock.Net/Server/WireMockServer.Admin.cs	65.79% <27.27%> (+7.19%)	⬆️
...reMock.Net/Server/WireMockServer.ConvertMapping.cs	43.75% <43.75%> (ø)
...k.Net/Matchers/Request/RequestMessageUrlMatcher.cs	47.22% <50.00%> (+0.79%)	⬆️
src/WireMock.Net/Serialization/MappingConverter.cs	55.94% <55.42%> (-7.85%)	⬇️
src/WireMock.Net/Matchers/SimMetricsMatcher.cs	63.79% <63.79%> (+4.96%)	⬆️
...ireMock.Net/Matchers/AbstractJsonPartialMatcher.cs	67.85% <66.66%> (ø)
src/WireMock.Net/Http/HttpClientBuilder.cs	72.41% <69.23%> (ø)
... and 86 more

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