List batch

{
  "object": "list",
  "data": [
    {
      "id": "batch_abc123",
      "object": "batch",
      "endpoint": "/v1/chat/completions",
      "errors": null,
      "input_file_id": "file-abc123",
      "completion_window": "24h",
      "status": "completed",
      "output_file_id": "file-cvaTdG",
      "error_file_id": "file-HOWS94",
      "created_at": 1711471533,
      "in_progress_at": 1711471538,
      "expires_at": 1711557933,
      "finalizing_at": 1711493133,
      "completed_at": 1711493163,
      "failed_at": null,
      "expired_at": null,
      "cancelling_at": null,
      "cancelled_at": null,
      "request_counts": {
        "total": 100,
        "completed": 95,
        "failed": 5
      },
      "metadata": {
        "customer_id": "user_123456789",
        "batch_description": "Nightly job",
      }
    },
    { ... },
  ],
  "first_id": "batch_abc123",
  "last_id": "batch_abc456",
  "has_more": true
}