generate also documentation for google.api options

[plandem]

It would be cool if it will be possible to get swager/raml output based on google.api options. https://github.com/googleapis/googleapis/blob/master/google/api/http.proto

E.g.: https://github.com/gengo/grpc-gateway/

P.S.: maybe introduce something like plugin that will understand options and will generate additional docs, based on these options.

[htdvisser]

I'll take this 👍 first part is in https://github.com/pseudomuto/protokit/pull/2

[perezd]

Seems like this should be closed, from what I can tell this works.