Block placing for MovementDecend

## Describe your suggestion
`MovementDescend` should be able to place the block it ends on just like `MovementAscend` and `MovementTraverse` can

## Settings
Everything that applies to block placement through `MovementAscend` and `MovementTraverse`, so none as far as I remember

## Context
Baritone can already bridge over gaps, build straight paths against walls and build upwards staircases against walls, but if it wants to go down a wall it has to either dig down or find a pre-built staircase because it can't just place one against said wall.

## Final checklist
- [x] I know how to properly use check boxes
- [x] I have only used two OwO's or UwU's in this issue.