List entity mappings

curl --request GET \
  --url https://api.mottostreaming.com/integration/spiideo/v1/entity_mappings \
  --header 'Authorization: Bearer <token>'

{
  "entity_mappings": [
    {
      "motto_entity_id": "<string>",
      "motto_entity_type": "<string>",
      "spiideo_object_id": "<string>",
      "spiideo_object_type": "SPIIDEO_OBJECT_TYPE_UNSPECIFIED",
      "description": "<string>"
    }
  ],
  "next_page_token": "<string>"
}