API protobuf generation

[wlynch]

Expected Behavior

I'd like to be able to embed knative/pkg types as protobufs. This is common with kubernetes types recently using go-to-protobuf, autogenerating the proto from the base Go type. (example - core/v1).

Actual Behavior

No protobufs exist. :(

Additional Info

I've tried playing around with go-to-protobuf generation for knative.dev/pkg/apis, but the automatic generation seems to have trouble with the apis.URL type, since it tries to generate the underlying url.URL struct. I tried to resolve this with a custom marshaller, but ran into issues (likely related to gogo/protobuf#678).

Sample command:

go-to-protobuf -p knative.dev/pkg/apis --go-header-file=../hack/boilerplate/boilerplate.go.txt --proto-import=../vendor

Changing the apis.URL type to a string with helper methods to convert into a url.URL might help ease proto generation while being compatible with exist API json/yaml formats, but I'm not sure if this will be considered a breaking change subject to the deprecation policy.

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