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/editor/src/editor_tests.rs

@@ -12539,6 +12539,7 @@ async fn test_language_server_restart_due_to_settings_change(cx: &mut TestAppCon
                 initialization_options: Some(json!({
                     "some other init value": false
                 })),
+                enable_lsp_tasks: false,
             },
         );
     });
@@ -12558,6 +12559,7 @@ async fn test_language_server_restart_due_to_settings_change(cx: &mut TestAppCon
                 initialization_options: Some(json!({
                     "anotherInitValue": false
                 })),
+                enable_lsp_tasks: false,
             },
         );
     });
@@ -12577,6 +12579,7 @@ async fn test_language_server_restart_due_to_settings_change(cx: &mut TestAppCon
                 initialization_options: Some(json!({
                     "anotherInitValue": false
                 })),
+                enable_lsp_tasks: false,
             },
         );
     });
@@ -12594,6 +12597,7 @@ async fn test_language_server_restart_due_to_settings_change(cx: &mut TestAppCon
                 binary: None,
                 settings: None,
                 initialization_options: None,
+                enable_lsp_tasks: false,
             },
         );
     });