Add /chunkborders command to bedrock & pocket edition.

Hello, Mojang Studios. I'd like you to add a new command to Bedrock & Pocket edition,

How it works:

Type "/chunkborders" or "/chunk_borders", then type false or true, true makes the chunk borders visible, false makes chunk borders invisible, but if you type true while the chunk borders are on, it shows this message: "Chunk Borders are already visible", same for false while the chunk borders are off.

Thank you Mojang Studios for reading and understanding.