More tree-sitter querries for C++

[VacheDesNeiges]

C++ highlighting via tree-sitter is poorly supported at the moment and can be vastly improved by writing a few more queries.

We can take a look at neovim's tree-sitter queries for guidance.

I've added two screenshot of the same C++ code, using zed and neovim, only highlighting with tree-sitter and the same theme(catppuccin mocha) to showcase the difference.

Zed's tree-sitter highlighting :

Neovim's tree-sitter higlighting :