Fix allowed regions handling

[Aurelien30000]

Overview

Fixes #364

Description

Manually add a region extent when performing a brush action:

• adapt block get/set to protected regions

Submitter Checklist

Preview Give feedback

1. Make sure you are opening from a topic branch (/feature/fix/docs/ branch (right side)) and not your main branch.
2. Ensure that the pull request title represents the desired changelog entry.
3. New public fields and methods are annotated with @since TODO.
4. I read and followed the contribution guidelines.

[dordsor21]

fwiw this is was FAWE does for //copy https://github.com/IntellectualSites/FastAsyncWorldEdit/blob/main/worldedit-core/src/main/java/com/sk89q/worldedit/command/ClipboardCommands.java#L286