updates to distroless

[Appu Goundan]

We updated the distroless build to use a new bazel ruleset. Some changes you might see:
- images are now use oci mediatypes
- images have more layers (one per debian package)
- a new rule set rules_oci replaces most of the heavy lifting that rules_docker did

If you depend on distroless and are running into issues, please open an issue on the github project page: github.com/GoogleContainerTools/distroless (edited)