Allow manually setting ToolCallId of Message

[StephenHodgson]

Discussed in #316

Feature Request

Overview

@sibbl
I want to build a message with a tool_call_id from scratch. Basically like in this python code from the OpenAI docs:

messages.append(
    {
        "tool_call_id": tool_call.id,
        "role": "tool",
        "name": function_name,
        "content": function_response,
    }
) 

Proposed Change

Message.cs:

diff --git forkSrcPrefix/OpenAI-DotNet/Chat/Message.cs forkDstPrefix/OpenAI-DotNet/Chat/Message.cs
index a16bd605a18dcb79d7e6c3a304b11b45a3bebb7f..227df6a2b8712c7dc07caeef94c92242ce223860 100644
--- forkSrcPrefix/OpenAI-DotNet/Chat/Message.cs
+++ forkDstPrefix/OpenAI-DotNet/Chat/Message.cs
@@ -65,6 +65,18 @@ namespace OpenAI.Chat
             ToolCallId = tool.Id;
         }
 
+        /// <summary>
+        /// Creates a new message to insert into a chat conversation.
+        /// </summary>
+        /// <param name="toolCallId">The tool_call_id to use for the message.</param>
+        /// <param name="toolFunctionName">Name of the function call.</param>
+        /// <param name="content">Tool function response.</param>
+        public Message(string toolCallId, string toolFunctionName, IEnumerable<Content> content)
+            : this(Role.Tool, content, toolFunctionName)
+        {
+            ToolCallId = toolCallId;
+        }
+
         /// <summary>
         /// The <see cref="OpenAI.Role"/> of the author of this message.
         /// </summary>