feat: avante repo map rust crate (#628)

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

@@ -0,0 +1,20 @@
+;; Capture public functions, structs, methods, and variable definitions
+(function_item) @function
+(impl_item
+  body: (declaration_list
+    (function_item) @method
+  )
+)
+(struct_item) @class
+(struct_item
+  body: (field_declaration_list
+    (field_declaration) @class_variable
+  )
+)
+(enum_item
+  body: (enum_variant_list
+    (enum_variant) @enum_item
+  )
+)
+(const_item) @variable
+(static_item) @variable