Method to get Poll ID from a Group

## Description
There's no way to (that I've found) to get a Poll_ID from a existing polls in a Group

## Research (if applicable)
On `https://developers.facebook.com/docs/workplace/integrations/custom-integrations/reference/group`, I found GET 'graph.facebook.com/{group-id}/feed?fields=attachments', which should return videos, images, files, or polls.