Add a function to hide skins.

In Minecraft Java Edition, someone only needs to know your in-game name to use software or websites where they can enter your name and obtain and use the skin you spent a lot of time creating. So I hope an option can be added on the skin change page to make the skin unobtainable. People who want to share their skin with others can set it to allow others to obtain it, and those who don't want others to use their skin can set it to disallow.