Create WireMock.Net.ProtoBuf project (#1350)

* Create WireMock.Net.ProtoBuf project

* ok

* Update Directory.Build.props

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/WireMock.Net.ProtoBuf/Util/ProtoBufUtils.cs

@@ -0,0 +1,47 @@
+// Copyright © WireMock.Net
+
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using JsonConverter.Abstractions;
+using ProtoBufJsonConverter;
+using ProtoBufJsonConverter.Models;
+using WireMock.ResponseBuilders;
+
+namespace WireMock.Util;
+
+internal class ProtoBufUtils : IProtoBufUtils
+{
+    public async Task<byte[]> GetProtoBufMessageWithHeaderAsync(
+        IReadOnlyList<string>? protoDefinitions,
+        string? messageType,
+        object? value,
+        IJsonConverter? jsonConverter = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (protoDefinitions == null || string.IsNullOrWhiteSpace(messageType) || value is null)
+        {
+            return [];
+        }
+
+        var resolver = new WireMockProtoFileResolver(protoDefinitions);
+        var request = new ConvertToProtoBufRequest(protoDefinitions[0], messageType!, value, true)
+            .WithProtoFileResolver(resolver);
+
+        return await SingletonFactory<Converter>
+            .GetInstance()
+            .ConvertAsync(request, cancellationToken).ConfigureAwait(false);
+    }
+
+    public IResponseBuilder UpdateResponseBuilder(IResponseBuilder responseBuilder, string protoBufMessageType, object bodyAsJson, params string[] protoDefinitions)
+    {
+        if (protoDefinitions.Length > 0)
+        {
+            return responseBuilder.WithBodyAsProtoBuf(protoDefinitions, protoBufMessageType, bodyAsJson);
+        }
+
+        // ProtoDefinition(s) is/are defined at Mapping/Server level
+        return responseBuilder.WithBodyAsProtoBuf(protoBufMessageType, bodyAsJson);
+    }
+}