* Add cgroup package

* Refactor procGgroup

* Add testdata generation

* Add v1 testdata generation

* Move scripts around

* Add integration test in CI

* Remove cgroup v1

* Move to cgroup struct

* Remove half-core test as it's redundant

GitHub Actions will drop support for ubuntu-20.04 soon.

This addresses the following warning from GitHub Actions:

    Node.js 16 actions are deprecated. Please update the following
    actions to use Node.js 20: actions/checkout@v3. For more information
    see:
    https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

A near-identical warning forced everyone to upgrade to v3 last year, so
this is some pointless churn, but let's just get it over with again...

This avoids the following warning from GitHub Actions:

    Node.js 12 actions are deprecated. Please update the following
    actions to use Node.js 16: actions/checkout@v2.

Signed-off-by: Joe Richey <joerichey@google.com>

Bump up the required Go version to 1.16 so that we can assume that Go
modules are enabled by default.  Go 1.16 is the latest end-of-life
release, so this makes it so that we support the latest end-of-life
release (1.16), the current maintainance release (1.17), the current
release (1.18), and future releases.  This the same approach we took
when we last bumped up the required Go version.

Also update the ci.yml file to test with these versions.

This avoids duplicate CI checks

Signed-off-by: Joe Richey <joerichey@google.com>

This is currently broken, and we don't really use the findings.

Signed-off-by: Joe Richey <joerichey@google.com>