Modular Grenades now fit in security belts/carriers (#34169)

Modular Grenades now fit in security belts/carriers (#34169)

* Added PayloadCase component to secbelt whitelist

* Replaced PayloadCase type whitelist with a tag

* fucking hell

* Add HandGrenade tag to all grenades
Grenades are so unbelievably cooked right now. I've counted about 4 separate baseitems that they inherit from whenever they feel like it. Why? They're all the same.

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Co-authored-by: Milon <milonpl.git@proton.me>
Co-authored-by: ArtisticRoomba <145879011+ArtisticRoomba@users.noreply.github.com>