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/rust.rs

@@ -8,6 +8,7 @@ use http_client::github::AssetKind;
 use http_client::github::{GitHubLspBinaryVersion, latest_github_release};
 pub use language::*;
 use lsp::{InitializeParams, LanguageServerBinary};
+use project::Fs;
 use project::lsp_store::rust_analyzer_ext::CARGO_DIAGNOSTICS_SOURCE_NAME;
 use project::project_settings::ProjectSettings;
 use regex::Regex;
@@ -628,9 +629,10 @@ impl ContextProvider for RustContextProvider {
 
     fn associated_tasks(
         &self,
+        _: Arc<dyn Fs>,
         file: Option<Arc<dyn language::File>>,
         cx: &App,
-    ) -> Option<TaskTemplates> {
+    ) -> Task<Option<TaskTemplates>> {
         const DEFAULT_RUN_NAME_STR: &str = "RUST_DEFAULT_PACKAGE_RUN";
         const CUSTOM_TARGET_DIR: &str = "RUST_TARGET_DIR";
 
@@ -798,7 +800,7 @@ impl ContextProvider for RustContextProvider {
                 .collect();
         }
 
-        Some(TaskTemplates(task_templates))
+        Task::ready(Some(TaskTemplates(task_templates)))
     }
 
     fn lsp_task_source(&self) -> Option<LanguageServerName> {