Jack Grigg

Rebased to address comments, fix merge conflict, and update `native_cmake` and `native_ccache`.

Rebased on `master` to bring in the new CI components, and updated the dependencies.

Hmm, CentOS 8 build is failing with: ``` checking for boostlib >= 1.77 (107700) includes in "/workspace/1c8fadc5-0194-47b2-911f-9725f712982d/source/depends/x86_64-pc-linux-gnu/share/../include"... yes checking for boostlib >= 1.77 (107700) lib path in "/workspace/1c8fadc5-0194-47b2-911f-9725f712982d/source/depends/x86_64-pc-linux-gnu/share/../lib/x86_64-linux-gnu"... no checking...

Still failing CentOS 8. I'm gonna have to set up an env locally to figure this out...

From @parazyd (originally in #512): > For newcomers and beginners, it would be good to have some general purpose API examples and docs on some things that might commonly be...

As with other arithmetic, any code we bring into `halo2` will ideally be temporary while we figure out the necessary APIs and integration. My goal is to land the generic...

The `ec-gpu` devs have just released a new version of the trait crate, which I believe is intended to help with the GPU side of this integration work.

This just landed in `subtle 2.3.0`.

It looks like `cargo-outdated` has actually had some more releases in the past year. But if it's failing to work with our dependency tree, then we should prefer `cargo-upgrades` which...

I originally made this branch 2 years ago, but never opened a PR for it. I've rebased it on v2.1.2-3, but not yet confirmed that it it still valid.