feat: add variables to ThrowError

Client.UnitTests/ThrowErrorTest.cs

@@ -17,17 +17,20 @@ public async Task ShouldSendRequestAsExpected()
             const string errorCode = "code 13";
             const string errorMessage = "This is a business error!";
             const int jobKey = 255;
+            const string variables = "{\"foo\":23}";
             var expectedRequest = new ThrowErrorRequest
             {
                 JobKey = jobKey,
                 ErrorCode = errorCode,
                 ErrorMessage = errorMessage,
+                Variables = variables
             };
 
             // when
             await ZeebeClient.NewThrowErrorCommand(jobKey)
                 .ErrorCode("code 13")
                 .ErrorMessage("This is a business error!")
+                .Variables(variables)
                 .Send();
 
             // then

Client/Api/Commands/IThrowErrorCommandStep1.cs

@@ -29,5 +29,13 @@ public interface IThrowErrorCommandStep2 : IFinalCommandWithRetryStep<IThrowErro
         ///     Call <see cref="IFinalCommandStep{T}.Send"/> to complete the command and send it to the broker.
         /// </returns>
         IThrowErrorCommandStep2 ErrorMessage(string errorMessage);
+
+        /// <summary>
+        /// Set the variables to send the error with.
+        /// </summary>
+        /// <param name="variables">the variables (JSON) as String.</param>
+        /// <returns>the builder for this command. Call <see cref="IFinalCommandWithRetryStep{T}.Send"/> to complete the command and send it
+        ///     to the broker.</returns>
+        IThrowErrorCommandStep2 Variables(string variables);
     }
 }

Client/Impl/Commands/ThrowErrorCommand.cs

@@ -52,6 +52,12 @@ public IThrowErrorCommandStep2 ErrorMessage(string errorMessage)
             return this;
         }
 
+        public IThrowErrorCommandStep2 Variables(string variables)
+        {
+            request.Variables = variables;
+            return this;
+        }
+
         public async Task<IThrowErrorResponse> Send(TimeSpan? timeout = null, CancellationToken token = default)
         {
             var asyncReply = gatewayClient.ThrowErrorAsync(request, deadline: timeout?.FromUtcNow(), cancellationToken: token);