Rust protoc to support generate service?

[tisonkun]

https://docs.rs/protobuf-codegen/4.31.1-release/protobuf_codegen/struct.CodeGen.html

This crate seems to handle protos definitions only. However, in practice when gRPC is involved, users typically define services along with messages.

prost-build has a method that allows gRPC implementor to provide their own integration:

• https://docs.rs/prost-build/latest/prost_build/struct.Config.html#method.service_generator
• https://docs.rs/prost-build/latest/prost_build/trait.ServiceGenerator.html

Otherwise, gRPC implementor may need to parse the proto files by themselves and bypass protobuf-codegen.

What do you think about gRPC support/extension?

cc @acozzette @esrauchg

[acozzette]

This pull request adds support for using our protobuf implementation with Tonic. Does that fit what you're looking for or would you like to see something that could support arbitrary other gRPC implementations?

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