Add note bundle option

Mostly helpful for AP to bring down the amount of progression items (if we do 10 notes per bundle, it'd bring it from 1000 to 100 by notes alone), but I think it'll also make it more exciting to find them in the built in rando. Inspired by seeing Pixel test his recomp AP implementation and think it's a really good idea.

Start by locating the note and progression-item generation paths, then trace how notes are placed in the built-in rando. Confirm the intended bundle-size option and verify that bundling reduces progression-item counts while keeping notes available in the randomizer.

Written by the indexing model from the issue text.