mv js client from runtime/client to client/js && modify generate-api-…

[enjoydiy]

…json output document && remove doc && add c sdk document to project cmake list && add c api generator to makefile

Checklist

• [ ] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added

[legendecas]

I'd suggest split the PR into multiple separated small PRs.