List all agents

curl --request GET \
  --url https://api.proficientai.com/agents

{
  "data": [
    {
      "id": "<string>",
      "object": "agent",
      "active": true,
      "description": "<string>",
      "display_description": "<string>",
      "display_name": "<string>",
      "name": "<string>",
      "created_at": 123,
      "updated_at": 123
    }
  ]
}