Get all account relationship types

curl --request GET \
  --url https://platform.thena.ai/v1/accounts/relationships/types \
  --header 'x-api-key: <api-key>'

[
  {
    "id": "ART123",
    "name": "Parent",
    "inverseRelationshipId": "ART124",
    "inverseRelationship": "Subsidiary",
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "metadata": {}
  }
]