extension: Update DAP extension API (#32448)

- DAP schemas will be stored in `debug_adapters_schemas` subdirectory in
extension work dir.
- Added Debug Config integration and such.

Release Notes:

- N/A

crates/extension_host/benches/extension_compilation_benchmark.rs

@@ -139,6 +139,7 @@ fn manifest() -> ExtensionManifest {
             args: vec!["hello!".into()],
         }],
         debug_adapters: Default::default(),
+        debug_locators: Default::default(),
     }
 }