feat(repo-map): zig support (#663)

* feature: zig support for repo map

* Update crates/avante-repo-map/Cargo.toml

Co-authored-by: yetone <yetoneful@gmail.com>

* fix: update lint error

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>

---------

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>
Co-authored-by: Aaron Pham <Aaronpham0103@gmail.com>
Co-authored-by: yetone <yetoneful@gmail.com>
Co-authored-by: Aaron Pham <contact@aarnphm.xyz>

crates/avante-repo-map/queries/tree-sitter-zig-defs.scm

@@ -0,0 +1,23 @@
+ ;; Capture functions, structs, methods, variable definitions, and unions in Zig
+(variable_declaration (identifier)
+  (struct_declaration
+        (container_field) @class_variable))
+
+(variable_declaration (identifier)
+  (struct_declaration
+        (function_declaration
+            name: (identifier) @method)))
+
+(variable_declaration (identifier)
+  (enum_declaration
+    (container_field
+      type: (identifier) @enum_item)))
+
+(variable_declaration (identifier)
+  (union_declaration
+    (container_field
+      name: (identifier) @union_item)))
+
+(source_file (function_declaration) @function)
+
+(source_file (variable_declaration (identifier) @variable))