Create identifier

curl --request POST \
  --url https://vault-api.stardust.gg/v1/profile/identifier \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "profileId": "<string>",
  "service": "<string>",
  "value": "<string>"
}'

{
  "rootUserId": "<string>",
  "profileId": "<string>",
  "service": "<string>",
  "value": "<string>",
  "createdAt": "2024-04-04T17:14:46.041Z",
  "type": "custom",
  "id": "<string>"
}