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.NUnit/WireMock.Net.NUnit.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <Description>Some extensions for NUnit</Description>
         <AssemblyTitle>WireMock.Net.NUnit</AssemblyTitle>
@@ -25,7 +25,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.9.0" />
+        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.12.0" />
         <PackageReference Include="NUnit" Version="4.4.0" />
         <PackageReference Include="Stef.Validation" Version="0.2.0" />
     </ItemGroup>