Add Grpc ProtoBuf support (request-response) (#1047)

* ProtoBuf

* .

* x

* ---

* x

* fx

* ...

* sc

* ...

* .

* groen

* x

* fix tests

* ok!?

* fix tests

* fix tests

* !

* x

* 6

* .

* x

* ivaluematcher

* transformer

* .

* sc

* .

* mapping

* x

* tra

* com

* ...

* .

* .

* .

* AddProtoDefinition

* .

* set

* grpahj

* .

* .

* IdOrText

* ...

* async

* async2

* .

* t

* nuget

* <PackageReference Include="ProtoBufJsonConverter" Version="0.2.0-preview-04" />

* http version

* tests

* .WithHttpVersion("2")

* <PackageReference Include="ProtoBufJsonConverter" Version="0.2.0" />

* HttpVersionParser

src/WireMock.Net.Abstractions/Admin/Settings/SettingsModel.cs

@@ -1,4 +1,6 @@
+using System.Collections.Generic;
 using System.Text.RegularExpressions;
+using JetBrains.Annotations;
 using WireMock.Handlers;
 using WireMock.Types;
 
@@ -114,6 +116,11 @@ public class SettingsModel
     /// </summary>
     public QueryParameterMultipleValueSupport? QueryParameterMultipleValueSupport { get; set; }
 
+    /// <summary>
+    /// A list of Grpc ProtoDefinitions which can be used.
+    /// </summary>
+    public Dictionary<string, string>? ProtoDefinitions { get; set; }
+
 #if NETSTANDARD1_3_OR_GREATER || NET461
     /// <summary>
     /// Server client certificate mode