Update rules_protobuf to rules_go 0.16.0

[katre]

This will involve removing the use of go_prefix in the rules.

See release notes for rules_go: https://github.com/bazelbuild/rules_go/releases/tag/0.16.0
Note on the deprecation and removal of go_prefix: bazel-contrib/rules_go#721

Note that rules_protobuf not updating holds back any project that depends on rules_protobuf.

[pcj]

Hi @katre I've pretty much totally rewritten these rules to layer on top of native.proto_library rule, now under a new organization. Still working on the documentation but they use a recent version of rules_go. There are a few features not included there but overall the rules are much simpler. I'd consider migrating to them. Hope that's not too disruptive.

https://github.com/stackb/rules_proto

[katre]

Hmm, this isn't actually my project I'm migrating, but I'll give it a shot, thanks.

[hlopko]

Hi Paul,
does it mean that these rules_protobuf are deprecated/unmaintained?

[katre]

@pcj I took a look at stackb/rules_proto, and I can't even build that (looks like there's a local_repository in the WORKSPACE for your own copy of rules_dotnet, and I can't figure out a online version to use).

[hlopko]

Can we get this PR merged here then?

[pcj]

This is an issue, not a PR. I'll create a PR on rules_k8s to update the protobuf rules.

[katre]

Thanks!