feat: Add csharp support to repo_map (#1073)

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

@@ -0,0 +1,25 @@
+(class_declaration
+  name: (identifier) @class
+  (parameter_list)? @method)  ;; Primary constructor
+
+(record_declaration
+  name: (identifier) @class
+  (parameter_list)? @method)  ;; Primary constructor
+
+(interface_declaration
+  name: (identifier) @class)
+
+(method_declaration) @method
+
+(constructor_declaration) @method
+
+(property_declaration) @class_variable
+
+(field_declaration
+  (variable_declaration
+    (variable_declarator))) @class_variable
+
+(enum_declaration
+  body: (enum_member_declaration_list
+    (enum_member_declaration) @enum_item))
+