Raid / Multi-mob spawning

[Fredthedoggy]

Description

I think there should be a way to spawn things, such as raids, and wandering traders within AOneBlock.

Is your feature request related to a problem?

N/A

Describe the solution you'd like us to implement.

A way to create a "MobPack" that could be used in the phases file. We could create a mobpack called "Raid" with all the raid mobs, and their chances, then just add the entity "raid" to the phases file. This would be useful in many situations

Describe alternatives you've considered.

Summon a specific mob that I don't use, kill it, and summon a new one

Additional context

N/A