List banner collections

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

{
  "banner_collections": [
    {
      "id": "<string>",
      "project_id": "<string>",
      "name": "<string>",
      "banner_ids": [
        "<string>"
      ],
      "visibility": "VISIBILITY_UNSPECIFIED"
    }
  ],
  "next_page_token": "<string>"
}