feat: Categorize Rust's keywords using more specific scopes (helix-editor#4510)

Author: poliorcetics

runtime/queries/rust/highlights.scm

@@ -111,23 +111,31 @@
 ; -------
 
 (for_expression
-  "for" @keyword.control)
+  "for" @keyword.control.repeat)
 ((identifier) @keyword.control
   (#match? @keyword.control "^yield$"))
+
+"in" @keyword.control
+
+[
+  "match"
+  "if"
+  "else"
+] @keyword.control.conditional
+
 [
   "while"
   "loop"
-  "in"
+] @keyword.control.repeat
+
+[
   "break"
   "continue"
 
-  "match"
-  "if"
-  "else"
   "return"
 
   "await"
-] @keyword.control
+] @keyword.control.return
 
 "use" @keyword.control.import
 (mod_item "mod" @keyword.control.import !body)
@@ -143,24 +151,28 @@
   "mod"
   "extern"
 
-  "struct"
-  "enum"
   "impl"
   "where"
   "trait"
   "for"
 
-  "type"
-  "union"
   "unsafe"
   "default"
   "macro_rules!"
 
-  "let"
-
   "async"
 ] @keyword
 
+[
+  "struct"
+  "enum"
+  "union"
+
+  "type"
+] @keyword.storage.type
+
+"let" @keyword.storage
+
 "fn" @keyword.function
 
 (mutable_specifier) @keyword.storage.modifier.mut