Add response body and headers processing

In the `InvokeRecActionCommandHandler` class, added code to read the response content as a string and store it in a `body` variable. Also, converted response headers into a dictionary and stored them in a `header` variable. These changes facilitate further processing of the response content and headers.

src/ReC.Application/RecActions/Commands/InvokeRecActionCommand.cs

@@ -37,6 +37,9 @@ public class InvokeRecActionCommandHandler(ISender sender) : IRequestHandler<Inv
                 "TRACE" => await http.SendAsync(new HttpRequestMessage(HttpMethod.Trace, action.EndpointUri), cancel),
                 _ => throw new BadRequestException($"The REST type {action.RestType} is not supported.")
             };
+
+            var body = await response.Content.ReadAsStringAsync(cancel);
+            var header = response.Headers.ToDictionary();
         }
     }
 }