feat: add document colorizer for tailwindcss

[PHSix]

Hi, recently I saw that document-color.nvim implements the document colorizer feature. I think it is very cool and useful. So I try to implements the some feature in coc-tailwindcss3.

[PHSix]

This job is still work in progress. Now I'm not sure if I need to compare the highlight information before and after two times to reduce the highlight refresh range.

[yaegassy]

Hi, Thanks for the PR. 🙇 However, the features of coc.nvim itself may already be able to handle this. Please give it a try.

coc-settings.json:

{
  "colors.enable": true
}

DEMO:

coc-tailwindcss3-document-color-enable.mp4

[yaegassy]

Hi, This PR is closed because it can already be handled by the functionality of coc.nvim itself. 🙇