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>