List proposals

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

{
  "items": [
    {
      "id": "<string>",
      "workspace_id": "<string>",
      "kind": "proposal",
      "agent_id": "<string>",
      "created_by_actor_id": "<string>",
      "assigned_actor_id": "<string>",
      "updated_by_actor_id": "<string>",
      "response_comment": "<string>",
      "responded_at": "2023-11-07T05:31:56Z",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "action_id": "<string>",
      "project_id": "<string>",
      "order_id": "<string>",
      "title": "<string>",
      "description": "<string>",
      "external_system": "<string>",
      "external_resource": "<string>",
      "external_source_key": "<string>",
      "external_url": "<string>",
      "external_intent_kind": "<string>",
      "external_intent_body": "<string>",
      "consumed_at": "2023-11-07T05:31:56Z",
      "resolved_at": "2023-11-07T05:31:56Z",
      "resolved_by_actor_id": "<string>",
      "resolved_action_id": "<string>",
      "resolved_project_id": "<string>",
      "resolution_summary": "<string>",
      "created_by_actor_name": "<string>",
      "created_by_agent_id": "<string>",
      "created_by_user_id": "<string>",
      "fortress_payload": "<unknown>",
      "external_payload": "<unknown>",
      "response_payload": "<unknown>"
    }
  ],
  "total": 1,
  "page": {
    "offset": 1,
    "limit": 123
  },
  "sort": "<string>",
  "filters": {},
  "hidden_count": 1
}