docs: fireworks tool calling docs (#18057)

docs/docs/integrations/chat/fireworks.ipynb

@@ -140,10 +140,58 @@
     "chat.invoke([system_message, human_message])"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "8c44cb36",
+   "metadata": {},
+   "source": [
+    "# Tool Calling\n",
+    "\n",
+    "Fireworks offers the [`FireFunction-v1` tool calling model](https://fireworks.ai/blog/firefunction-v1-gpt-4-level-function-calling). You can use it for structured output and function calling use cases:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "id": "ee2db682",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'function': {'arguments': '{\"name\": \"Erick\", \"age\": 27}',\n",
+      "              'name': 'ExtractFields'},\n",
+      " 'id': 'call_J0WYP2TLenaFw3UeVU0UnWqx',\n",
+      " 'index': 0,\n",
+      " 'type': 'function'}\n"
+     ]
+    }
+   ],
+   "source": [
+    "from pprint import pprint\n",
+    "\n",
+    "from langchain_core.pydantic_v1 import BaseModel\n",
+    "\n",
+    "\n",
+    "class ExtractFields(BaseModel):\n",
+    "    name: str\n",
+    "    age: int\n",
+    "\n",
+    "\n",
+    "chat = ChatFireworks(\n",
+    "    model=\"accounts/fireworks/models/firefunction-v1\",\n",
+    ").bind_tools([ExtractFields])\n",
+    "\n",
+    "result = chat.invoke(\"I am a 27 year old named Erick\")\n",
+    "\n",
+    "pprint(result.additional_kwargs[\"tool_calls\"][0])"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "8c44cb36",
+   "id": "2321a4e6",
    "metadata": {},
    "outputs": [],
    "source": []