[values4k] Proposing support for KSUID

[oharaandrew314]

The KSUID is the K-Sortable UID. It's meant to be a URL-safe identifier with an embedded timestamp and large random space.

https://segment.com/blog/a-brief-history-of-the-uuid/

https://github.com/segmentio/ksuid

I find it very useful. Would you be interested in adopting it into values4k? The intention is for the KSUID library to be a compile-only dependency. The value and its factory would require you to bring in your version of the library.