Allow keyword to have different colors

[takkuumi]

Check for existing issues

• Completed

Describe the feature

VSCODE allows KEYWORD to have different colors.

ZED only allows KEYWORD to have one color.

Environment

Software:

System Software Overview:

  System Version: macOS 15.1.1 (24B91)
  Kernel Version: Darwin 24.1.0
  Boot Volume: Macintosh HD - 数据
  Boot Mode: Normal
  Computer Name: takumi’s MacBook Pro
  User Name: takumi (takumi)
  Secure Virtual Memory: Enabled
  System Integrity Protection: Enabled
  Time since boot: 9 days, 1 hour, 56 minutes

Hardware:

Hardware Overview:

  Model Name: MacBook Pro
  Model Identifier: MacBookPro16,1
  Processor Name: 8-Core Intel Core i9
  Processor Speed: 2.3 GHz
  Number of Processors: 1
  Total Number of Cores: 8
  L2 Cache (per Core): 256 KB
  L3 Cache: 16 MB
  Hyper-Threading Technology: Enabled
  Memory: 32 GB
  System Firmware Version: 2069.40.2.0.0 (iBridge: 22.16.11072.0.0,0)
  OS Loader Version: 582~2132
  Serial Number (system): C02CH7B5MD6T
  Hardware UUID: A8F6E96A-6964-57F2-ACDE-E6C43E3C665D
  Provisioning UDID: A8F6E96A-6964-57F2-ACDE-E6C43E3C665D
  Activation Lock Status: Enabled

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[uncenter]

This is a Rust-specific highlights improvement issue.
Zed's Rust queries group all keywords under @keyword:

zed/crates/languages/src/rust/highlights.scm

Lines 78 to 117 in 0511f92

	[
	"as"
	"async"
	"await"
	"break"
	"const"
	"continue"
	"default"
	"dyn"
	"else"
	"enum"
	"extern"
	"fn"
	"for"
	"if"
	"impl"
	"in"
	"let"
	"loop"
	"macro_rules!"
	"match"
	"mod"
	"move"
	"pub"
	"ref"
	"return"
	"static"
	"struct"
	"trait"
	"type"
	"union"
	"unsafe"
	"use"
	"where"
	"while"
	"yield"
	(crate)
	(mutable_specifier)
	(super)
	] @keyword

We should look at how nvim-treesitter does this instead, breaking up the keywords into semantic groups such as @keyword.function for the fn keyword and @keyword.conditional for match: https://github.com/nvim-treesitter/nvim-treesitter/blob/c47d8d27d047634d00a07ca80a1b694624743b38/queries/rust/highlights.scm#L239-L344