Add moderator types

[SuperMarioDaBom]

Resolves #XXX

Changes:

This PR adds the ability for users applying to moderator roles to specify which moderation role they want to apply to. This information is then used to send this application to a channel based upon the role. This is to allow each moderation group to have their own place to discuss & handle applicants. This update is necessary as we continue to work to add proper definitions & separation of concerns for each moderation group.

• I have read and agreed to the Code of Conduct.
• I have read and complied with the contributing guidelines.
• What I'm implementing was an approved issue.
• I have tested all of my changes.

[MatthewL246]

General comment: I don't think a Discord bot is the right place for forum mod applications, mainly because forum mods shouldn't necessarily be required to have a Discord account.

Besides that, this seems like a very reasonable change.

[SuperMarioDaBom]

Updated this PR to be a draft, as it seems we have a number of things to figure out before a change like this can be fully deployed (as discussed on Discord).

For now, I will be implementing:

• When running the mod-application slash command for a forum mod role, instead of popping up the modal, a message will be displayed pointing the user to the proper place to apply on the forum.
• Only discord mod, vc mod, and forum mod (w/ redirect) will be enabled as we figure out solutions for the other two.