Adding UUIDv6 & UUIDv7

[Vlix]

Just wanted to set up an issue to track the status of this draft so that if/when it's accepted, it could be added to this library.

[kephas]

It's been renamed from draft-peabody-dispatch-new-uuid-format to draft-ietf-uuidrev-rfc4122bis.

[joeyh]

It would also be useful to add UUIDv8, which is also in that spec.

[phadej]

The new rfc9562 was published in May 2024, and it includes v6, v7 and v8

[bgohla]

I'd like to contribute a v7 implementation, unless someone is already working on that.

[shinzui]

The mmzk-typeid package has a v7 implementation.

[malteneuss]

Could some maintainer have another look at #87? Seems to be ready for another round.