Feature request name
Move addCurativeItem() from MCPotionEffectInstance to MCPotionEffect

Feature request description
Not really a new feature, but I really think that addCurativeItem() should be moved from MCPotionEffectInstance to MCPotionEffect, as that makes more sense. (Currently, MCPotionEffectInstance.addCurativeItem also doesn't work, because it can only be performed on a specific effect instance, effectively making the method useless there.)

Feature request reason
as stated above

Feature request dependencies
none

Game Version
1.16

You can't change the curative item on an effect that you don't control (if you are coding a mod and making a custom effect, you can do it, but since these are vanilla effects you can't).

You could use something like the MCRightClickItemEvent to detect when a player right clicks your item and then check if they have the effect and remove it.

If I was coding a mod to add more curative items, I would do it through an event.