fix: remove index from preconditions folder

[favna]

This was causing index to be loaded many times over.

To preserve the same names of the top level exports of
CorePreconditions.UserPermissionsPreconditionContext and CorePreconditions.CooldownContext
I had to rename them internally because otherwise they reference themselves.
I tried to import them with as ... but that doesn't work because of our type bundling step.

This is what I got when adding loggers for onLoad and onUnload:

For store preconditions loading piece ClientPermissions
For store preconditions loading piece Cooldown
For store preconditions loading piece DMOnly
For store preconditions loading piece Enabled
For store preconditions loading piece GuildNewsOnly
For store preconditions loading piece GuildNewsThreadOnly
For store preconditions loading piece GuildOnly
For store preconditions loading piece GuildPrivateThreadOnly
For store preconditions loading piece GuildPublicThreadOnly
For store preconditions loading piece GuildTextOnly
For store preconditions loading piece GuildThreadOnly
For store preconditions loading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece index
For store preconditions unloading piece index
For store preconditions loading piece NSFW
For store preconditions loading piece UserPermissions