feat: Add uuid extension

[rfhb]

This is a proposal to add uuid() functions as per source code here: https://www.sqlite.org/src/file?name=ext/misc/uuid.c&ci=tip. The documentation is updated, and simple tests are included. Local devtools::test() completed without errors.

I trust that users will welcome to be able to generate UUIDs within the database, as this is performant and can be part of SQL logic (such as in my use case). There do not seem to be risks or unintended consequences (e.g., footprint, performance, security aspects).

Possibly the same could be said about other extensions in the source repository; not sure if you plan for others to be included or a generic mechanism for compiling even with sources from outside the SQLite repository?

Many thanks for considering!

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[krlmlr]

Thanks, very useful!