Create tenant user

curl --request POST \
  --url https://api.usenaive.ai/v1/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "external_id": "<string>",
  "email": "jsmith@example.com",
  "label": "<string>",
  "account_kit_id": "<string>",
  "metadata": {}
}
'

{
  "id": "<string>",
  "external_id": "<string>",
  "email": "<string>",
  "label": "<string>",
  "account_kit_id": "<string>",
  "is_default": true,
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "last_active_at": "2023-11-07T05:31:56Z"
}