feature: donate choleraehyq/pid to gopkg

[choleraehyq]

Donate choleraehyq/pid, which is widely used inside bytedance.

Signed-off-by: Cholerae Hu [email protected]

[choleraehyq]

cc @YangruiEmma @PureWhiteWu @zhangyunhao116

[zhangyunhao116]

Thanks!
Not sure the pid still needs to be updated after each Go release? if so, I worry that it will make the entire repository unavailable after the Go version update.

[choleraehyq]

Thanks! Not sure the pid still needs to be updated after each Go release? if so, I worry that it will make the entire repository unavailable after the Go version update.

@zhangyunhao116 Yes, currently it needs to be updated after each Go release.