Send user info BE after posting malicious links

[DecentralizedDan]

In the case that a user posts a malicious website, Bouncer will send to BE:

• user ID
• user name
• avatar hash
• the malicious URL
• whether they are a bot (?)
• The whole message?

Here are the Discord API docs for the user object, which we'd be getting these values from: https://discord.com/developers/docs/resources/user#user-object

For client-side implementation (which will probably happen first) see #53

[jmercouris]

@DecentralizedDan What is the BE? The backend?