chore: update lua-resty-websocket library annotations

[flrgh]

👋

This PR updates the annotations for lua-resty-websocket, adding docstrings and parameter definitions from the repo. The objects created by resty.websocket.server and resty.websocket.client are almost the same, so I factored out a lot of the common methods/fields into a class at resty.websocket.

I'm new to writing EmmyLua annotations for this language server and don't understand everything yet, so please let me know if there is anything that I should fix regarding formatting, naming conventions, etc. (I think it would be great if there were a contribution/style guide for 3rd party type definitions, to encourage other folks in the community to pitch in).

I do a lot of work on OpenResty, so if you like this PR I will probably follow-up with more :)

[CppCXY]

the basic resty annotation make by me , you can make pr for this too.
vscode emmylua codestyle plugin can be used for basic code style, this is not official advice

[flrgh]

@CppCXY hi! Thanks for chiming in.

Should I submit duplicate PRs in both repos then?

[sumneko]

Thanks for your PR, and welcome to follow-up this!