feat: add support for OCI helm charts digest pinning

[tollsimy]

close: #6155

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[Skaronator]

Personally I would keep it similar how docker and other OCI tools treat versions and digest in a single field with the <version>@sha syntax but looks like helm itself will probably use seperate fields as well. So this is fine. Maybe it makes sense to wait a bit longer for the HIP to finalize?

helm/helm#32133
https://github.com/helm/community/pull/441/changes
https://github.com/helm/helm/pull/32142/changes#diff-dbbed30713935982e88e0e2cea901d8ba96b4a7de12e8067f3fe1d2a800df88dR39

[tollsimy]

Thanks for the feedback @Skaronator!
I'd also like to be as consistent as possible with Helm.

I responded to the HIP thread, let's see how that goes.