Provide a option to disable the generation of generate.go in ent/contrib/entproto

[Zxilly]

• I have searched the issues of this repository and believe that this is not a duplicate.

Summary 💡

As for now, entproto only have one option called WithProtoDir(dir string) to set the proto dir. I wonder is that possible to provide another option to disable the generation of generate.go.
We have other tools to handle proto compilation, thus no need for this file. And we have to manually delete it each time after ent genetate.

Motivation 🔦

protoExt, _ := entproto.NewExtension(entproto.WithProtoDir(""), entproto.WithEnableProtoGenerateHelper(false))

[rotemtam]

Hi @Zxilly

Thanks for reaching out. I’m in favor of adding such an option to entproto. Would you like to contribute this change ? I’m happy to guide you through the process

[Zxilly]

I can make a PR after May.15. Before that I have some other thing to deal with.