iamb: Key Sequence Timeout

[fuguesoft]

Dublicate of ulyssa/iamb #409

It'd be cool if there was a way to specify a millisecond delay timeout for key sequences.
This would enable exiting insert mode with the sequence 'ii' but also make a word like radii less cumbersome to type.

As it stands, iamb's input buffer waits indefinitely for the completion of the sequence instead of waiting for a user-specified window and then inserting the initial character that would have started a sequence.

https://0x0.st/82ir.mp4

oh-snap-2025-03-30_16.22.41.mp4