Rename ipython to tool (#756)

See https://github.com/meta-llama/llama-models/pull/261 for the
corresponding PR in llama-models.

Once these PRs land, you need to work `main` from llama-models (vs. from
pypi)

tests/client-sdk/agents/test_agents.py

@@ -40,10 +40,10 @@ class TestClientTool(ClientTool):
             response_str = f"Error when running tool: {e}"
 
         message = ToolResponseMessage(
+            role="tool",
             call_id=tool_call.call_id,
             tool_name=tool_call.tool_name,
             content=response_str,
-            role="ipython",
         )
         return [message]