core[patch]: Improve console.log format for messages

[jacoblee93]

Checked console.dir(message, { depth: null }) and JSON.stringify(message)

Before:

AIMessage {
  lc_serializable: true,
  lc_kwargs: {
    content: '',
    tool_calls: [ [Object] ],
    invalid_tool_calls: [],
    additional_kwargs: { function_call: undefined, tool_calls: [Array] },
    response_metadata: {},
    id: 'chatcmpl-9m7NDoFInLTEzw9rF8cLv8mbE2BxQ'
  },
  lc_namespace: [ 'langchain_core', 'messages' ],
  content: '',
  name: undefined,
  additional_kwargs: { function_call: undefined, tool_calls: [ [Object] ] },
  response_metadata: {
    tokenUsage: { completionTokens: 30, promptTokens: 63, totalTokens: 93 },
    finish_reason: 'tool_calls'
  },
  id: 'chatcmpl-9m7NDoFInLTEzw9rF8cLv8mbE2BxQ',
  tool_calls: [
    {
      name: 'pet_expert',
      args: [Object],
      type: 'tool_call',
      id: 'call_kKW7x1wBsICArIvQwdo5Oty0'
    }
  ],
  invalid_tool_calls: [],
  usage_metadata: { input_tokens: 63, output_tokens: 30, total_tokens: 93 }
}

After:

AIMessage {
  "id": "chatcmpl-9m8idsKhvNqDIanBP9kj17Ig1ytQ2",
  "content": "",
  "additional_kwargs": {
    "tool_calls": [
      {
        "id": "call_4t74hRzUwQ9yDRbPg8oftyzi",
        "type": "function",
        "function": "[Object]"
      }
    ]
  },
  "response_metadata": {
    "tokenUsage": {
      "completionTokens": 30,
      "promptTokens": 63,
      "totalTokens": 93
    },
    "finish_reason": "tool_calls"
  },
  "tool_calls": [
    {
      "name": "pet_expert",
      "args": {
        "context": "pirate",
        "question": "What are dogs known for?",
        "answer_style": "short"
      },
      "type": "tool_call",
      "id": "call_4t74hRzUwQ9yDRbPg8oftyzi"
    }
  ],
  "invalid_tool_calls": [],
  "usage_metadata": {
    "input_tokens": 63,
    "output_tokens": 30,
    "total_tokens": 93
  }
}

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