this PR is add YiAi model client and has passed unit testing.
I can provide my api_key if needed for testing
the PR content:
chat client spring starter unit test chat client documents For some reasons, products from OpenAI and others can't be directly used in Chinese Mainland.
YiAi is a big model platform, A variety of models are offered, among which Yi-1.5 are fully free. Although their API design is quite strange.
the link: YiAI