Seedbank

This adds a function to get an stdlib RNG.

Working types and initialization, preparing towards the 0.2.0 release.

This adds exports and docs to improve usability, small changes mostly.

Pre-release of SeedBank 0.2, with types and doc improvements. Only supports Python 3.10 and later (per SPEC0).

Cleanup release, fixing a bug with Python 3.11 and supporting CuPy.

What's Changed
* Use lenskit-build-tools for CI by mdekstrand in https://github.com/lenskit/seedbank/pull/12
* Add support for CuPy by mdekstrand in https://github.com/lenskit/seedbank/pull/13
* Clean up CI and extend to Python 3.11 by mdekstrand in https://github.com/lenskit/seedbank/pull/14


**Full Changelog**: https://github.com/lenskit/seedbank/compare/v0.1.2...v0.1.3

New release with the file initialization feature (10).

Merged PRs

* Update to use PEP631 project layout (11) mdekstrand
* Support seeding from initialization files (10) mdekstrand
* Build with Python 3.10 (4) mdekstrand