Bush Compatibility for Mods

[JPAKx4]

Cobblemon Dev here trying to fix an incompatibility with our berry blocks and the harvester.

Based on my understanding of HarvesterMovementBehaviour.java, the only reason Sweet Berry Bushes works is because it is hardcoded to reduce age to 1 to keep the bush at full size. I would like it to be possible for me to tell Create what the age I want the crop reduced to, and the age that the plant can be harvested at (max age by default).