Introduce a Webhook-Specific Permission/Partial for Attachment Access in Game Data Webhooks

[CapricanDRJ]

I am working on a Discord bot for Hades' Star, a popular online space strategy game. In the upcoming Hades' Star 2025.1 update, server admins will be able to configure Discord webhooks that deliver game event data solely via attached data.json files. These webhook messages consist only of the attachment. Once the update is released, my bot will rely on these attachments to process time-sensitive in-game events. Hades' Star has explicitly stated that they will NOT send webhook data anywhere but discord.

The problem is that bots must enable the MESSAGE_CONTENT intent to download these attachments, even though there’s no message content to access. I don’t need message content for regular messages, only the attachments from specific webhooks. Enabling partials doesn’t help either, as webhook attachments remain unavailable without full message content access.