Add continuous integration

[BackdoorTech]

1. add jest
2. add puppeteer
3. add unit test
4. add functional test
5. add github actions
6. add file .env.example don't forget to create .env file locally use the default setting in the .env.example
7. change tsconfig.json -> strict = false
8. change tsconfig.json -> moduleResolution = Node
9. change TableColumn interface, the attribute index is no longer required, because it was not set while creating connection in the example/index.html

[BackdoorTech]

Well done!