Update Permissions to include newly documented External Sticker Permission

Created by: Lulalaby

Summary

Implements the following permissions to DSharpPlus.Permissions:

• USE_EXTERNAL_STICKERS

Details

Adds the following permissions to the Permissions enum.

• UseExternalStickers

Changes proposed

• Add Permissions.UseExternalStickers with a value of 0x0000002000000000

• Modify the FULL_PERMS and All values to the result of the old All value and all new values resulting to a new value of 274877906943