Add command for applying bonemeal to a selection

### The Problem

I like to make large structures, like walls, out of mushrooms (mushrooms, not mushroom blocks). I plant the mushrooms by hand or with WorldEdit, and then go back and apply bonemeal to them manually. There have been other times I've needed to apply bonemeal to a large area, too, but I don't remember the reasons.

### A Solution

A command to apply bonemeal to a WorldEdit selection.

### Alternatives

I could implement this as a Bukkit plugin using the WorldEdit API, but I feel this may benefit a large sum of users, including those of Fabric and Forge, which I have no experience with.

### Anything Else?

_No response_