feat: add sample_douyin demo

[demoasm]

What type of PR is this?

feat

What this PR does / why we need it (en: English/zh: Chinese):

en: add sample_douyin demo using cloudwego-eco (hertz, kitex and its contribs).
zh:

[CLAassistant]

All committers have signed the CLA.

[GuangmingLuo]

@demoasm Thanks for your contribution. Please sign CLA and solve CI issues.

[GuangmingLuo]

@demoasm Please solve the CI issues in lint and compliant. For example, add paths-ignore for kitex_gen folder in .licenserc.yaml file

[demoasm]

@GuangmingLuo Hi, I have fixed all lint issues and edited the README.

[GuangmingLuo]

ERROR the following files don't have a valid license header:
sample_douyin/api_request/api_service/api_service.go
sample_douyin/api_request/api_service/hertz_client.go
sample_douyin/cmd/api/mw/my_jwt.go

[L2ncE]

It seems that many places are imitating easy-note. What's the meaning of such biz-demo.

[GuangmingLuo]

It seems that many places are imitating easy-note. What's the meaning of such biz-demo.

Thanks for pointing it out. For example, when I check the the mw implementation, they seem to be copied from easy-note.