Implement "admin only" commands

[ankith26]

Description

We need a way to limit some commands to be run by only bot admins (people who are responsible for maintaining the server and this codebase).

Tasks

• Read discord IDs of admins that must be set in .env file.
• Add a check function that checks if a given member ID is a bot admin.
• Make backend_info an admin command.
• unverify (ref: Implement unverify class of commands #10)
• Make query/role admin-able commands so that admins can run it outside the "academic server" constraint.
• We can later add more admin-convenience functions usable from discord, stuff like logs/status/ping commands.

[someyuck]

Hi, I'd like to work on this