Basic verilog support

[andreytkachenko]

Verilog files support

• syntax highlighting
• language server svlangserver
• some textobjects

[the-mikedavis]

the highlights just need to be aligned with the scopes we use: https://docs.helix-editor.com/themes.html#syntax-highlighting

[the-mikedavis]

It looks like this will conflict with vlang: #2526

I'm not sure how we should handle a conflict like this. I suppose it'll be up to anyone using either to set up

# ~/.config/helix/languages.toml
use-grammars = { except = [ "v" ] }
# or
use-grammars = { except = [ "verilog" ] }

But I'm not sure which one should win being default 🙃

[the-mikedavis]

Looks good, thanks for working on this!