Feature request: faster method of selecting high levels

[zohassadar]

When testing the crunch mode crash, I thought it would be nice to choose higher levels a bit faster. I had the idea of pressing right to add 10, but when going to add this feature to try it out I found there was precedent that was obviously not desired: https://github.com/kirjavascript/TetrisGYM/blob/b499e7eb07df4da2c4d51679c2f8586af9f176eb/src/gamemode/levelmenu.asm#L259

Instead, I tried out holding A to jump by 10 instead of 1. This required a slight modification to the menu throttle routine.

[kirjavascript]

thanks for the PR!

the code looks good, I think I just need to think a while on if the UX is ideal