[feature request] Support generic OCI image in `init --provisioners`

[mathieu-benoit]

To complete https://github.com/score-spec/score-compose/pull/175, it would be great to support generic OCI image to import external provisioners.

https://opencontainers.org/

Example:

score-compose init --provisioners oci://...

Wondering if for this we could use the ORAS client:

• https://oras.land/
• https://github.com/oras-project/oras-go/blob/main/example_test.go