[Spike] Research whether it's possible to set an exact order in which structures and features will generate together

[PersonTheCat]

In vanilla, world carvers, configured features, and structure starts all generate in insertion order. We will want a way to precisely configure the order in which these features generate; perhaps some kind of "x before y / a after b" type of system, or even some way to set an exact order.

Additionally, we should consider whether it makes sense to support generating configured features and carvers in alternation. I am leaning towards no, but will be open to other suggestions in the comments.

[PersonTheCat]

This can be implemented in one of two ways:

• Create a custom ChunkStatus for combined features and carvers, placing it after carvers, but before features (using Mixin)
• Modify the existing feature status to spawn carvers in addition to features, deciding how best to approach the duplication in work done by the original status (e.g. by removing the carver status or conditionally enabling the new logic)

Due to the complexity of this problem, it is my opinion that it is not an ideal target for release 1.0 and should be saved for later.