Add `runc.Features(ctx)` to wrap `runc features`

[AkihiroSuda]

See https://github.com/opencontainers/runtime-spec/blob/v1.1.0-rc.2/features.md

Availability:

• runc: supported since runc v1.1.0
• crun: https://github.com/containers/crun/issues/1177
• youki: https://github.com/containers/youki/issues/815

[codecov-commenter]

Codecov Report

Patch coverage: 55.55% and project coverage change: +0.70 :tada:

Comparison is base (f5d58d0) 20.69% compared to head (d20f83b) 21.40%.

:exclamation: Current head d20f83b differs from pull request most recent head 6d29289. Consider uploading reports for the commit 6d29289 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ========================================== + Coverage 20.69% 21.40% +0.70% ========================================== Files 7 7 Lines 715 724 +9 ========================================== + Hits 148 155 +7 - Misses 527 528 +1 - Partials 40 41 +1 ``` | [Impacted Files](https://app.codecov.io/gh/containerd/go-runc/pull/97?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=containerd) | Coverage Δ | | |---|---|---| | [runc.go](https://app.codecov.io/gh/containerd/go-runc/pull/97?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=containerd#diff-cnVuYy5nbw==) | `21.78% <55.55%> (+0.76%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/containerd/go-runc/pull/97/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=containerd)

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[AkihiroSuda]

Can we release go-runc v1.1.0 after merging this?

[fuweid]

Can we release go-runc v1.1.0 after merging this?

SGTM