Allow prioritizing block breaking based on Y coord

## Describe your suggestion
Prioritize mining/block breaking at current Y value before moving downward.

## Settings
Penalize block breaking beyond a certain boundary from your current Y value. For example, at = 1, anything beyond +-1 from your current Y value has a block breaking penalty of +x (possibly through another setting).

## Context
Useful for chunk clearing/flattening, and for general mining and clearing. It reduces inefficiency by breaking X amounts of blocks below you before pillaring up, breaking the next set of blocks, removing the old pillar, pillaring up, etc etc.

UPDATE: I have since learned of clearArea but even this command proves inefficient. It adds a few more blocks worth of horizontal breaking but then continues downward. Toggling allowDownward to false does not help either.

## Final checklist
- [x] I have not used any OwO's or UwU's in this issue.