Add illumination feature to `#sel` commands

## Describe your suggestion
The `#sel` command should have an "illuminate" option. `#sel illuminate` would use torches and/or other light-emitting blocks (glowstone, redstone torches, beacons (?), lava (????), etc.) to light up the selected area(s). By default, it should light up every surface area enough to prevent mob spawns; but it should also take an argument to illuminate the area to a selected level.

## Examples
`#sel illuminate` - Light up the selected area with basic torches enough to prevent mob spawns.
`#sel illuminate 10` - Light up the selected area to a minimum light level of 10.
`#sel illuminate glowstone` - Light up the selected area enough to prevent mobs from spawning using only glowstone blocks.
`#sel illuminate redstone_torch beacon 3` - Illuminate the area to a light level of at least 3, using only redstone torches and beacons.

Perhaps there could also be a similar command or configuration to remove all light from an area. `#sel illuminate 0`, perhaps? However, there are already workarounds that can achieve this result (mine torches, replace lava with stone, etc)

## Context
It's would be a handy feature for construction projects where you want something to be lit up, either for aesthetic purposes or to guide/restrict the spawning of monsters.

## Final checklist
- [x] I know how to properly use check boxes
- [x] I have not used any OwO's or UwU's in this issue.