Support vscode pyright extention

[fonghou]

Is your feature request related to a problem? Please describe.
Microsoft put out a type check pyright. It'll be a great addition to coc.nvim.

Describe the solution you'd like
pyright is implemented in pure typescript (5x faster than mypy), with tight integration in vscode. It seems fit coc.nvim's design very well.

Describe alternatives you've considered
pyright doesn't provide a standalone lsp server. microsoft/pyright#99 has some details.

Additional context
https://marketplace.visualstudio.com/items?itemName=ms-pyright.pyright

[fannheyward]

Try https://github.com/fannheyward/coc-pyright

[fonghou]

@fannheyward, thanks for working it so quickly!

I just test it briefly. It works great, however, it seems not picking up pyrightconfig.json.

[chemzqm]

You can create issue at https://github.com/fannheyward/coc-pyright/issues