List proposals

curl --request GET \
  --url https://api.propal.io/v1/proposals \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "proposal_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "title": "<string>",
      "slug": "<string>",
      "deal_status": "<string>",
      "page_status": "<string>",
      "payment_status": "<string>",
      "language": "<string>",
      "created_at": "<string>",
      "sent_at": "<string>",
      "published_at": "<string>",
      "lead_id": "<string>",
      "lead_name": "<string>",
      "lead_email": "<string>",
      "is_deleted": true,
      "is_archived": true
    }
  ],
  "pagination": {
    "has_more": true,
    "next_cursor": "<string>",
    "total_count": 123
  }
}