Add SystemTextJsonMatchers (#1447)

* SystemTextJsonMatcher

* ,

* .

* new projectx

* Update test/WireMock.Net.Tests/Pact/PactTests.cs

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* Update test/WireMock.Net.Tests/WebSockets/WebSocketIntegrationTests.cs

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* Update src/WireMock.Net/WireMock.Net.csproj

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* Update src/WireMock.Net.Minimal/Properties/AssemblyInfo.cs

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* .

* more tests

* .

* .

* x

* ...

* .

* fix tests

* 0.11.0

* .

* delete jsonutils.cs

* s

* fix findings

* Apply suggestions from code review

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* Potential fix for pull request finding 'Missing Dispose call on local IDisposable'

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* JsonConverter 0.12.0

* -- tools

---------

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src/WireMock.Net.Minimal/Owin/Mappers/OwinRequestMapper.cs

@@ -53,7 +53,8 @@ internal class OwinRequestMapper : IOwinRequestMapper
                 ContentType = request.ContentType,
                 DeserializeJson = !options.DisableJsonBodyParsing.GetValueOrDefault(false),
                 ContentEncoding = contentEncodingHeader?.FirstOrDefault(),
-                DecompressGZipAndDeflate = !options.DisableRequestBodyDecompressing.GetValueOrDefault(false)
+                DecompressGZipAndDeflate = !options.DisableRequestBodyDecompressing.GetValueOrDefault(false),
+                DefaultJsonConverter = options.DefaultJsonSerializer
             };
 
             body = await BodyParser.ParseAsync(bodyParserSettings).ConfigureAwait(false);