Add option to disable baby zombie creatures

Suggestion to add a /gamerule command and 'Game Rules' toggle (in the world creation menu) to disable all baby zombies, including their husk, drowned, and piglin types, similar to the option of disabling phantoms in-game.

For many of those who may find the challenge of this particular mob too insufferable or unfair, to have a simple option to disable baby zombies and all their variant types in within the game rules' settings.