[Feature]: support goctl rpc skip generate pb files.

[chaozwn]

trafficstars

An bro @wuqinqiang in front of me has done the corresponding code, I have improved him and done the corresponding test at the same time.

Related article: https://juejin.cn/post/7394823316584824869

[kesonan]

This will have an impact on the health of rpc generation, and such adjustments are temporarily unacceptable.

[kevwan]

Duplicate of #4079