Add the ability to change the background colour of code blocks

[amarakon]

I would like to be able to change the background colour of code blocks in Markdown and R Markdown. The colour should span across the entire window, not just the background of the text. Also, the lines for backticks should not be affected by this.

[MDeiml]

This can not be implemented in this repo, but depends on the specific editor you're using this parser with. E.g. for neovim you should ask for this feature in nvim-treesitter. What editor are you using? Maybe I can point you in the right direction.

[amarakon]

I am using Neovim, sorry I forgot to specify.

[MDeiml]

Ok thanks. Then you should suggest this feature in nvim-treesitter. It should be possible to implement this without changing the parser.