feat(highlight): link to treesitter highlight groups instead of vim ones since themes revolve around them

[aMOPel]

:h treesitter-highlight-groups

All @<group> tree sitter highlights are linked to classic vim highlights, so nothing is really lost here, if a theme doesn't use @<group> highlights, but this increases compatibility with modern themes which use @<group> highlights.

Also this enables the use of nimsuggest's semantic highlights with treesitter highlights. Otherwise the colors will clash.

[aMOPel]

I added a version check as well now.

You might wanna double check if I found the correct version.

I looked at the git blame
where the default links were added and then looked at what version that commit was added
which seemed to be v0.9.0.
At least that's when all of them were done.

[alaviss]

LGTM