Adding maven generation support

[Paul-Etienne]

This is more a feature request than an issue per se.

Would it be possible to add a maven plugin to allow Protobuf generation for Swift?
This would be very helpful.

[thomasvl]

Not knowing anything really about Maven, does it have to be provided by this project, or would it make sense for it to be an independent project?

[ktoso]

Nothing has to be done here because the maven plugin allows for a custom protoc plugin to be used, in the compile-custom target: https://www.xolstice.org/protobuf-maven-plugin/compile-custom-mojo.html you'd set it up to target the swift protobuif binary and it should work just fine.

[ktoso]

It could be nice to add a specific target for swift, as there exist for other languages ( https://www.xolstice.org/protobuf-maven-plugin/ ) but that would be done in the maven plugin, not here.

[thomasvl]

Based on @ktoso's comments, it sounds like we should go ahead and close this since it doesn't need to be something in this repo. Is that ok?

[Pushkarang]

@ktoso Do we always have to generate binary (either building it from source / homebrew) and use it? Is there a maven artifact published for swift-protobuf similar to https://mvnrepository.com/artifact/io.grpc/protoc-gen-grpc-java/1.60.1