zeta2: Parse imports via Tree-sitter queries + improve zeta retrieval-stats (#39735)

Release Notes:

- N/A

---------

Co-authored-by: Max <max@zed.dev>
Co-authored-by: Agus <agus@zed.dev>
Co-authored-by: Oleksiy <oleksiy@zed.dev>

crates/languages/src/rust/config.toml

@@ -17,3 +17,5 @@ brackets = [
 collapsed_placeholder = " /* ... */ "
 debuggers = ["CodeLLDB", "GDB"]
 documentation_comment = { start = "/*", prefix = "* ", end = "*/", tab_size = 1 }
+ignored_import_segments = ["crate", "super"]
+import_path_strip_regex = "/(lib|mod)\\.rs$"

crates/languages/src/rust/imports.scm

@@ -0,0 +1,27 @@
+(use_declaration) @import
+
+(scoped_use_list
+    path: (_) @namespace
+    list: (_) @list)
+
+(scoped_identifier
+    path: (_) @namespace
+    name: (identifier) @name)
+
+(use_list (identifier) @name)
+
+(use_declaration (identifier) @name)
+
+(use_as_clause
+    path: (scoped_identifier
+       path: (_) @namespace
+       name: (_) @name)
+    alias: (_) @alias)
+
+(use_as_clause
+    path: (identifier) @name
+    alias: (_) @alias)
+
+(use_wildcard
+    (_)? @namespace
+    "*" @wildcard)