Add default method for CompletionProvider::resolve_completions (#32045)

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -20325,11 +20325,13 @@ pub trait CompletionProvider {
 
     fn resolve_completions(
         &self,
-        buffer: Entity<Buffer>,
-        completion_indices: Vec<usize>,
-        completions: Rc<RefCell<Box<[Completion]>>>,
-        cx: &mut Context<Editor>,
-    ) -> Task<Result<bool>>;
+        _buffer: Entity<Buffer>,
+        _completion_indices: Vec<usize>,
+        _completions: Rc<RefCell<Box<[Completion]>>>,
+        _cx: &mut Context<Editor>,
+    ) -> Task<Result<bool>> {
+        Task::ready(Ok(false))
+    }
 
     fn apply_additional_edits_for_completion(
         &self,