debugger: Mark DapLocator::create_scenario as an async function (#32680)

Paves way for locators in extensions.

Release Notes:

- N/A

crates/dap/src/registry.rs

@@ -19,11 +19,11 @@ use std::{collections::BTreeMap, sync::Arc};
 pub trait DapLocator: Send + Sync {
     fn name(&self) -> SharedString;
     /// Determines whether this locator can generate debug target for given task.
-    fn create_scenario(
+    async fn create_scenario(
         &self,
         build_config: &TaskTemplate,
         resolved_label: &str,
-        adapter: DebugAdapterName,
+        adapter: &DebugAdapterName,
     ) -> Option<DebugScenario>;
 
     async fn run(&self, build_config: SpawnInTerminal) -> Result<DebugRequest>;