[FREEBIE] Get guild id from invite

Now closed

[ :heavy_check_mark: ] I have read and understand the Cogboard Bounty rules

Discord Username: upuri

Payment Information: paypal, BTC, LTC, probably around $3

Description of Cog
A cog that returns the guild id of a guild from the invite given, e.g:
[p]guildid discord.gg/example
[bot response] 123456789

V2 or V3: V3

API’s or other information: n/a

Other info (Bounty, issues, ETC) n/a