API for hiding areas in the Map List / Map Search

### I am planning on implementing this myself

No

### Describe your request

in case hooking Everest internals is still a problem, I'd like to propose a possible API for hiding certain areas in the Map List / Map Search, that mods such as CollabUtils2 can make use of

I'm currently not yet sure if I'll try to implement that, but it would be helpful

### Additional context

_No response_