CMake support for plugins in generate_protobuf

[pgoodman]

What language does this apply to? All languages.

Describe the problem you are trying to solve. Using CMake to build a project that uses gRPC, I'd like to be able to provide a plugin command to generate_protobuf. Partial support is there in the form of LANGUAGE grpc and GENERATE_EXTENSIONS .grpc.pb.h .grpc.pb.cc but there's no way to pass in the plugin information.

Describe the solution you'd like A way to pass in the plugin name and path.

Describe alternatives you've considered Trying to force it through the LANGUAGE; it doesn't work.

[faaxm]

@pgoodman @acozzette Only found this issue after creating PR #7249 that fixes this. Please have a look. :)

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