Add initial package.json scripts task autodetection (#32497)

Now, every JS/TS-related file will get their package.json script
contents added as tasks:

<img width="1020" alt="image"
src="https://github.com/user-attachments/assets/5bf80f80-fd72-4ba8-8ccf-418872895a25"
/>

To achieve that, `fn associated_tasks` from the `ContextProvider` was
made asynchronous and the related code adjusted.

Release Notes:

- Added initial `package.json` scripts task autodetection

---------

Co-authored-by: Piotr Osiewicz <piotr@zed.dev>

crates/languages/src/python.rs

@@ -481,9 +481,10 @@ impl ContextProvider for PythonContextProvider {
 
     fn associated_tasks(
         &self,
+        _: Arc<dyn Fs>,
         file: Option<Arc<dyn language::File>>,
         cx: &App,
-    ) -> Option<TaskTemplates> {
+    ) -> Task<Option<TaskTemplates>> {
         let test_runner = selected_test_runner(file.as_ref(), cx);
 
         let mut tasks = vec![
@@ -587,7 +588,7 @@ impl ContextProvider for PythonContextProvider {
             }
         });
 
-        Some(TaskTemplates(tasks))
+        Task::ready(Some(TaskTemplates(tasks)))
     }
 }