Adds UUID v7 support

[burner]

No description provided.

[dlang-bot]

Thanks for your pull request, @burner!

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Testing this PR locally

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[burner]

related to #9881 (comment)

[thewilsonator]

what happened to version 6?

[burner]

I don't know, the documentation https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html#name-uuid-version-6 is here.

v7 is a big deal as it works very well with DB's and contains a reasonable timestamp.

[thewilsonator]

I note that link also mentions a v8

[thewilsonator]

silly question, what about this.data[7]? is that a -?

[burner]

data[7] is random data, the version [6] and variant [8] are not stored next to each other
https://www.rfc-editor.org/rfc/rfc9562.html#name-uuid-version-7

uuid are strange data layout wise IMO

[burner]

@thewilsonator thank you

[thewilsonator]

std/uuid.d(344:9)[warn]: A unittest should be annotated with at least @safe or @system
std/uuid.d(1385:6)[warn]: Public declaration 'timestampRandomUUID' has no documented example.
std/uuid.d(1790:11)[warn]: Public declaration 'generateV7RandomData' is undocumented.
std/uuid.d(1791:12)[warn]: Local imports should specify the symbols being imported to avoid hiding local symbols.
std/uuid.d(1864:1)[warn]: A unittest should be annotated with at least @safe or @system
std/uuid.d(1879:1)[warn]: A unittest should be annotated with at least @safe or @system
std/uuid.d(1892:1)[warn]: A unittest should be annotated with at least @safe or @system

[burner]

@thewilsonator passed already, thank you