List categories

Sometimes you want to allow the user to choose something multiple times. This is why there are option lists, but sometimes you need the user to select multiple things this is what a list category is for. Those would look something like this

I implemented this already in my mod camera tweaks for adding custom third persons but the code is extremely cursed and incompatible so an official API would be great.

If you would like to implement this here is my mixin spagetti for reference:
https://github.com/ItsFelix5/CameraTweaks/blob/master/src/main/java/cameratweaks/Config.java
https://github.com/ItsFelix5/CameraTweaks/blob/master/src/main/java/cameratweaks/ThirdPerson.java
https://github.com/ItsFelix5/CameraTweaks/blob/master/src/main/java/cameratweaks/mixin/YACLScreenMixin.java
https://github.com/ItsFelix5/CameraTweaks/blob/master/src/main/java/cameratweaks/mixin/OptionListWidgetMixin.java

Start by reviewing the linked CameraTweaks files, especially Config.java, ThirdPerson.java, YACLScreenMixin.java, and OptionListWidgetMixin.java, then compare their behavior with the library's existing option-list API. Define the official list-category API and verify that it supports selecting multiple entries without the referenced mixin work.