New "M-x face" command

[jb3]

Add a new M-x face command to generate DevOps team compatible avatars given
uploaded files/attached URLs.

For several reasons, this command should not be opened wider than the DevOps
team:

• It passes mostly untrusted URL data into ImageMagick
• It allows for endpoints in cluster to be hit through arbitrary URL hitting
• It runs things in a blocking context

For this reason, this command is only a bit of fun for DevOps role members and
should never be wider than that.

[jb3]

@ChrisLovering review comments addressed.

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ExtensionFailed: Extension 'arthur.exts.systems.system_information' raised an error: ImportError: MagickWand share... discord.ext.commands.bot in _load_from_module_spec View Issue

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