Support tasks from rust-analyzer (#28359)

(and any other LSP server in theory, if it exposes any LSP-ext endpoint
for the same)

Closes https://github.com/zed-industries/zed/issues/16160

* adds a way to disable tree-sitter tasks (the ones from the plugins,
enabled by default) with
```json5
"languages": {
  "Rust": "tasks": {
      "enabled": false
    }
  }
}
```
language settings

* adds a way to disable LSP tasks (the ones from the rust-analyzer
language server, enabled by default) with
```json5
"lsp": {
  "rust-analyzer": {
    "enable_lsp_tasks": false,
  }
}
```

* adds rust-analyzer tasks into tasks modal and gutter:

<img width="1728" alt="modal"
src="https://github.com/user-attachments/assets/22b9cee1-4ffb-4c9e-b1f1-d01e80e72508"
/>

<img width="396" alt="gutter"
src="https://github.com/user-attachments/assets/bd818079-e247-4332-bdb5-1b7cb1cce768"
/>


Release Notes:

- Added tasks from rust-analyzer

crates/project/src/project_tests.rs

@@ -459,6 +459,8 @@ async fn test_fallback_to_single_worktree_tasks(cx: &mut gpui::TestAppContext) {
                 active_item_context: Some((Some(worktree_id), None, TaskContext::default())),
                 active_worktree_context: None,
                 other_worktree_contexts: Vec::new(),
+                lsp_task_sources: HashMap::default(),
+                latest_selection: None,
             },
             cx,
         )
@@ -481,6 +483,8 @@ async fn test_fallback_to_single_worktree_tasks(cx: &mut gpui::TestAppContext) {
                     worktree_context
                 })),
                 other_worktree_contexts: Vec::new(),
+                lsp_task_sources: HashMap::default(),
+                latest_selection: None,
             },
             cx,
         )
@@ -797,7 +801,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             .receive_notification::<lsp::notification::DidCloseTextDocument>()
             .await
             .text_document,
-        lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(path!("/dir/test3.rs")).unwrap(),),
+        lsp::TextDocumentIdentifier::new(lsp::Url::from_file_path(path!("/dir/test3.rs")).unwrap()),
     );
     assert_eq!(
         fake_json_server