Add optional version to RANDOM_UUID function and generator of version 7 in addition to existing version 4

Improves performance when UUID is being used as primary key.

Spec
  https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format
Discussion
  https://news.ycombinator.com/item?id=28088213