Highlight `while` as `@keyword.rust`

[SvenFibelkorn]

Keywords like pub, fn and for get highlighted as keywords. Inspect in neovim shows @keyword.rust links to Keyword rust. Keywords like while and loop, break and continue, if and else however do not show @keyword.rust.

Some themes italicize @keyword.rust and having for italicized but not while presents a minor visual inconsistency.

[amaanq]

This is (likely?) an nvim-treesitter issue not an issue w/ tree-sitter-rust, and even then it's hard to discern the issue... all the ones you mentioned not showing @keyword.rust either are @conditional or @repeat