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/IResponseMessage.cs

@@ -40,11 +40,16 @@ public interface IResponseMessage
     /// </summary>
     IDictionary<string, WireMockList<string>>? Headers { get; }
 
+    /// <summary>
+    /// Gets the trailing headers.
+    /// </summary>
+    IDictionary<string, WireMockList<string>>? TrailingHeaders { get; }
+
     /// <summary>
     /// Gets or sets the status code.
     /// </summary>
     object? StatusCode { get; }
-    
+
     /// <summary>
     /// Adds the header.
     /// </summary>
@@ -53,9 +58,23 @@ public interface IResponseMessage
     void AddHeader(string name, string value);
 
     /// <summary>
-    /// Adds the header.
+    /// Adds the trailing header.
     /// </summary>
     /// <param name="name">The name.</param>
     /// <param name="values">The values.</param>
     void AddHeader(string name, params string[] values);
+
+    /// <summary>
+    /// Adds the trailing header.
+    /// </summary>
+    /// <param name="name">The name.</param>
+    /// <param name="value">The value.</param>
+    void AddTrailingHeader(string name, string value);
+
+    /// <summary>
+    /// Adds the header.
+    /// </summary>
+    /// <param name="name">The name.</param>
+    /// <param name="values">The values.</param>
+    void AddTrailingHeader(string name, params string[] values);
 }