Feature: Provide world scaling for elite mobs

### Describe your feature request or suggestion in detail

While you can scale the mobs in a dungeon, there are often a large number of elite mobs on the way to the dungeon. Additionally, there are commonly elite quests that would normally need anywhere from 2-5 players to complete.

I would like to see an option to add autobalance to world elite mobs (player count only, no level scaling) to better allow for sub-intended player count play.

### Describe a possible solution to your feature or suggestion in detail

Due to this affecting the entire world it should be off by default.

The setting itself can do 1 of 2 things, with the second option likely being prohibitive due to the amount of work:
- When on, scale all elite mobs in the world to a configured number of players
- When on, scale all elite mobs down to the configured number of players relative to their intended group size to clear.
- Example: You have the setting enabled to scale all elites to 3 players
- Mobs that normally expect 5 player groups to clear are scaled down to 3
- Mobs that normally expect 2 player groups to clear are not scaled

The second option would require a lot of manual work and I believe is prohibitively tedious. The first option would work well for personal servers running for only 1 or a few players that only play together.

### Additional context

_No response_

No files, tests, or entry points are named. Start by tracing the existing dungeon mob scaling in the autobalance module; done would require an opt-in setting that scales world elite mobs by player count without level scaling, with the default-off behavior agreed.

Written by the indexing model from the issue text.