New idea for caves generation in 1.17

In 21w07a, I didn't really like the generation of the new Grimstone,
it spawns too high and takes up half of the entire size of the caves, 
which in my opinion is not very good and I have a new proposal for generating caves.
From 64 to 20 heights there will be ordinary small caves.And from 20 there will
be already shorter and more elongated caves which will lead to the giant caves 
from 21w06a which will generate from 0 to -40. But already from -40 to -64 will 
generate narrow but very long caves completely made of Grimstone.