feat: native ft and syntax

[gacallea]

Use native setfiletype and syntax when implmented in Vim/Neovim: https://github.com/vim/vim/issues/13886

[gacallea]

I've submitted my own syntax: https://github.com/vim/vim/issues/13886#issuecomment-1902668123 :)

• [x] filetype accepted
• [x] syntax accepted

[gacallea]

https://github.com/vim/vim/pull/13895

[gacallea]

both filetype and syntax were merged into vim. next: https://github.com/gacallea/chuck-nvim/issues/13