Add admin-per-modpack

[FireController1847]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
It would be nice if I was able to assign/remove admin's access to certain modpacks. Such as making some modpacks visible to some admins and the rest not visible (so they can't modify it or delete it). If it's too much work no worries but wanted to throw the idea out there.

Describe alternatives you've considered
I don't think there are any other than trusting those who use it :)

Additional context
N/A