Issue description

Add a new display mode where overlay is shown when using a spyglass.

I've implemented this in 1.20.1 Kirisoup@579fe57 for my personal use, my implementation might be bad but I think this is a neat feature to add.

Sorry I am very new to mc modding ;_;

Ideally yes because I don't want to bother porting things so I prefer to only maintain it on 1.21

There are some problems with your changes because the server side will refuse to fetch data if the target is too far from the player. Also you should only multiply the result of mc.gameMode.getPickRange() by 3, not the whole expression.

I will merge this feature if you can resolve these problems and open a PR.

In that case should I commit to the main branch instead?