WildStacker Stacked Spawner Support

[NFRCG]

Description

Is your feature request related to a problem?

In the Levels addon, Stacked Spawners are not supported, only Barrels. This means if you wanted to add or subtract from Island Level for a user having these stacked spawners, it will only add or subtract for one spawner and not the size of the stacked spawner.

Describe the solution you'd like us to implement.

The Levels addon should calculate how many spawners are within a Stacked Spawner block, and add/subtract the island level based on this amount. I am under the impression that the publicly available WildStacker API could support this.

Describe alternatives you've considered.

Given the circumstances, there are no real alternatives outside of removing Stacked Spawners from my server.

Additional context

N/A

[Poslovitch]

Related to BentoBoxWorld/BentoBox#644