Add list of function calls and results in ToolCallSummaryMessage (#6626)

To address the comment here:
#6542 (comment)

Author: ekzhu

python/packages/autogen-agentchat/src/autogen_agentchat/agents/_assistant_agent.py

@@ -1289,6 +1289,8 @@ def default_tool_call_summary_formatter(call: FunctionCall, result: FunctionExec
             chat_message=ToolCallSummaryMessage(
                 content=tool_call_summary,
                 source=agent_name,
+                tool_calls=[call for call, _ in normal_tool_calls],
+                results=[result for _, result in normal_tool_calls],
             ),
             inner_messages=inner_messages,
         )

python/packages/autogen-agentchat/src/autogen_agentchat/messages.py

@@ -426,6 +426,12 @@ class ToolCallSummaryMessage(BaseTextChatMessage):
 
     type: Literal["ToolCallSummaryMessage"] = "ToolCallSummaryMessage"
 
+    tool_calls: List[FunctionCall]
+    """The tool calls that were made."""
+
+    results: List[FunctionExecutionResult]
+    """The results of the tool calls."""
+
 
 class ToolCallRequestEvent(BaseAgentEvent):
     """An event signaling a request to use tools."""