feat: add go-grpc_opt and go_opt for grpc new command

[chowyu12]

add go-grpc_opt and go_opt for grpc new command

[kesonan]

@chowyu12 rpc new 为什么需要这两个参数，由于 goctl rpc new 的proto内容都是内置生成的，所以不存在proto不规范问题，一般*_opt主要用于控制 go_package ，所以这里我认为没有必要。

Why does rpc new need these two parameters? Since the proto content of goctl rpc new is built-in, there is no proto irregularity problem. Generally, *_opt is mainly used to control go_package, so I don't think it is necessary here.

[chowyu12]

@anqiansong 我这边项目使用了自定义模板，基于https://github.com/zeromicro/go-zero-template, 更新的goctl后生成的代码反馈错误

goctl更新前后区别是：

使用--go-grpc_opt=require_unimplemented_servers=false 可以解决