Add a module named "suggestion"

@Locked-chess-official
Having that said, I appreciate that there might be some scope in levelling up string alignment stuff in stdlib. This has also been briefly mentioned in `seqtools` (`alglib` / `seqlib`) as a desirable place for better / new algorithms.

What is your motivation for this?
Is it that you are not happy with difflib’s results?
Is performance a bottleneck for you?
What is your application?