Quick and simple fix for Andesite, Diorite, Granite to make natural stratum

For one, these ores don't look natural when taking in the new caves into account. For two, caves currently don't have easy markers for elevation. A relatively quick and easy way to help fix these two problems without introducing new logic or features could be to do the following;

• Ore blobs only spawn withing a certain elevation, ± 12 blocks. You could have Dirt only generating above Y = 48, and Clay generating between Y = 64 and 48. Diorite spawning only in tall mountains, at Y = 96, while Granite spawns at Y = 0 to let careful miners know what their depth is without using F3. Tuff blobs could generate below Y = -24, which would help give the deep underground more of a sense of place.

• Instead of spawning uniformally, ore blobs spawn frequently in certain chunks and barely at all in other chunks. Paired with the previous change, this would make it so that you can have some caves covered in a layer of Granite, or some caves with more Clay than others. It would almost feel like a microbiome.

Everything needed to do make this happen is already part of the world generation system; no need for new configured features. All you'd really need to do for a hotfix would be to change the spawn count and depth average (range) of the already existing ores.

Here's a demonstration of the change for Granite only. Notice that it spawns frequently in only specific regions, and only at a specific height: