Add proper version information to protoc-gen-go-plugin and generated files

[asmfreak]

I had a very dumb (on my part) issue with this library today. I tried using protoc-gen-go-plugin when the library was 0.8.0. Several days ago I decided to run a quick new project with it just to test things. I've compiled things around the new plugin expecting go-plugin library and then begin testing the actual plugin parts. And than I had trouble getting a minimal plugin to compile. I tried a lot of unproductive things until I noticed that my go.mod had go-plugin at 0.9.0, but I had protoc-gen-go-plugin at 0.8.0.

My main issue is - please add version tag to compiler. I'm not sure the best way to do this.

[asmfreak]

Since go 1.18 there is a way to read debuginfo information about version: this reddit post. There is even this library earthboundkid/versioninfo, which can read versioninfo from go installed binaries.