git action

[baiyutang]

1. add git action config.
2. remove example dir，the code writed in kitex-examples is better.
3. update copyright.

[bytedance-oss-robot]

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[lizhemingi]

Thank you for your contribution.

I think keep the example would be better, since we can easily find a usage example in the current repo and run when cloned instead of going to another one.

[lizhemingi]

It would be very nice if you can squash the commits after you finished the code. @baiyutang

[baiyutang]

It would be very nice if you can squash the commits after you finished the code. @baiyutang

done

[GuangmingLuo]

1. add git action config.
2. remove example dir，the code writed in kitex-examples is better.
3. update copyright.

you may update your pr description.