Add full UUID functionality to stdlib

[oxinabox]

This is an issue to track adding remaining UUID functionality to the stdlib.
It is the continuation of #25590 for the stuff that wasn't closed in #25819

Quoting from #25590

We already have working code for UUID versions 1, 3, 4 & 5 and version 2 seems to be pretty marginal, so we have pretty complete UUID support already, it could just stand to be wrapped up a little more nicely.

UUID 1, and 4 are done.
UUID 5 requires SHA.jl to be added to stdlib,
UUID 4 requires MD5.jl to be added to stdlib (MD5.jl requires SHA.jl anyway)
For reference: https://en.wikipedia.org/wiki/Universally_unique_identifier#Versions_3_and_5_(namespace_name-based)

Apparently UUID 2 doesn't matter, but it doesn't actually look too hard to implement

So

• UUID 1
• UUID 2
• UUID 3
• UUID 4
• UUID 5
• UUID7 Add UUID version 7 #54834

[StefanKarpinski]

Apparently UUID 2 doesn't matter, but it doesn't actually look too hard to implement

That was my impression from doing some relatively casual research, but I could have been wrong. We may as well implement it...

[Seelengrab]

#54834 added UUID7