Inline utils from rules_docker go pkg

[mrmeku]

For #723

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[alexeagle]

awesome nice to see you again @mrmeku :)

[alexeagle]

what about this one, should it be inlined too? I guess you'll have a later PR to drop the go_repository that fetches rules_docker code. I don't know what is the maintenance story for rules_k8s so maybe we should wait-and-see if we get any responses.

[mrmeku]

Yeah, maybe that one should also be inlined as part of this change. I had held off since that particular import needs to be translated to understand the OCI image format rather than the format rules_docker is outputting today. But that translation could easily be done in a followup PR after inlining in this one

[alexeagle]

@chases2 hi, are you the maintainer here?