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.Shared/Settings/SimpleSettingsParser.cs

@@ -1,6 +1,7 @@
 // Copyright © WireMock.Net
 
 using System.Collections;
+using JsonConverter.Abstractions;
 using WireMock.Extensions;
 using WireMock.Util;
 
@@ -191,9 +192,9 @@ internal class SimpleSettingsParser
         return GetValue(name, values => values.FirstOrDefault());
     }
 
-    public T? GetObjectValueFromJson<T>(string name)
+    public T? GetObjectValueFromJson<T>(string name, IJsonConverter jsonConverter)
     {
         var value = GetValue(name, values => values.FirstOrDefault());
-        return string.IsNullOrWhiteSpace(value) ? default : JsonUtils.DeserializeObject<T>(value!);
+        return string.IsNullOrWhiteSpace(value) ? default : jsonConverter.Deserialize<T>(value!);
     }
 }

src/WireMock.Net.Shared/Settings/WireMockServerSettings.cs

@@ -14,6 +14,7 @@ using WireMock.Logging;
 using WireMock.Matchers;
 using WireMock.Models;
 using WireMock.RegularExpressions;
+using WireMock.Transformers;
 using WireMock.Types;
 
 namespace WireMock.Settings;
@@ -362,11 +363,31 @@ public class WireMockServerSettings
     /// Default is <see cref="NewtonsoftJsonConverter"/>.
     /// </remarks>
     [PublicAPI]
-    public IJsonConverter DefaultJsonSerializer { get; set; } = new NewtonsoftJsonConverter();
+    public IJsonConverter DefaultJsonSerializer { get; set; }
+
+    /// <summary>
+    /// Gets or sets the default JSON body transformer used for template-based JSON body transformations.
+    /// </summary>
+    /// <remarks>
+    /// Set this property to provide a custom implementation for transforming JSON and ProtoBuf body content.
+    /// Default is <see cref="NewtonsoftJsonBodyTransformer"/>.
+    /// </remarks>
+    [PublicAPI]
+    [JsonIgnore]
+    public IJsonBodyTransformer DefaultJsonBodyTransformer { get; set; }
 
     /// <summary>
     /// WebSocket settings.
     /// </summary>
     [PublicAPI]
     public WebSocketSettings? WebSocketSettings { get; set; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WireMockServerSettings"/> class.
+    /// </summary>
+    public WireMockServerSettings()
+    {
+        DefaultJsonSerializer = new NewtonsoftJsonConverter();
+        DefaultJsonBodyTransformer = new NewtonsoftJsonBodyTransformer(this);
+    }
 }