Add option to prevent entities from being moved from plot

[SirYwell]

Overview

Description

We already have an option to prevent entities from wandering off plots themselves due to pathfinding, but they can still be pushed outside (or pulled with a leash). Using Paper's EntityMoveEvent, we can also prevent such actions.
The feature is disabled by default to not affect behavior of existing setups.

Submitter Checklist

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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.