Provides a picking backend to add integration with [`bevy_ecs_tilemap`](https://github.com/StarArawn/bevy_ecs_tilemap),
enabling individual Tile entities to receive the picking triggers.
In addition to the plugins for picking and `bevy_ecs_tilemap`, simply add the `TilemapBackend` to the App. Then, any entity with the `TileBundle`
should be able to receive picking events.
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