Create managed observability config

curl --request POST \
  --url https://api.example.com/api/v1/observability/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "observability": {
    "config": {
      "host": "https://cloud.langfuse.com",
      "publicKey": "",
      "secretKey": "",
      "runName": ""
    },
    "provider": "LANGFUSE",
    "enabled": true
  }
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "observability": {
    "config": {
      "host": "https://cloud.langfuse.com",
      "publicKey": "",
      "secretKey": "",
      "runName": ""
    },
    "provider": "LANGFUSE",
    "enabled": true
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "agent_count": 0
}