v021: refinements and optimizations

[danlentz]

WIP

• [x] Create deps.edn
• [x] Enhanced Randomness of v7 sub-counter
• [ ] Improvements to docs
• [ ] Revisit v1,v6 lsb; make clear that v1 lsb does not disclose mac address
• [x] Transition clj-uuid to clj-uuid.core namespace in order to avoid incompatibility of single segment namespaces with GraalVM. issue description

Resolves:

• https://github.com/danlentz/clj-uuid/issues/57
• https://github.com/danlentz/clj-uuid/issues/58