[NESHawk Request] Mesen's Adaptive Sprite Limit

Mesen has a feature called "Automatically re-enable sprite limit as needed to prevent graphical glitches when possible". The reason I'd like to have it in BizHawk is not to "make the games look better", but to use it for research purposes. Some games use excess sprites for masking effects, as documented in this nesdev page: https://wiki.nesdev.com/w/index.php/Sprite_overflow_games

What I want to do is go through the commercial games library and with such feature, detect which games make use of this behavior through a visual indicator of some sort. Like saying "Sprite Limit Enabled" or "Sprite Limit Disabled" according to each frame. Then expand that incomplete nesdev list and hopefully build a full database of it. Some people have requested such a thing online before, so it could prove useful.

No BizHawk file, test, or entry point is named. Begin by studying Mesen’s adaptive sprite-limit behavior and the linked nesdev description of sprite-overflow games, then locate the BizHawk NES core and UI areas responsible for the sprite limit and per-frame status. Done means the adaptive behavior works for research and visibly indicates whether the limit is enabled or disabled on each frame.