debugger: Add extensions support (#30625)

Closes #ISSUE

Release Notes:

- N/A

---------

Co-authored-by: Anthony <anthony@zed.dev>

crates/extension_api/src/extension_api.rs

@@ -187,6 +187,16 @@ pub trait Extension: Send + Sync {
     ) -> Result<(), String> {
         Err("`index_docs` not implemented".to_string())
     }
+
+    /// Returns the debug adapter binary for the specified adapter name and configuration.
+    fn get_dap_binary(
+        &mut self,
+        _adapter_name: String,
+        _config: DebugTaskDefinition,
+        _user_provided_path: Option<String>,
+    ) -> Result<DebugAdapterBinary, String> {
+        Err("`get_dap_binary` not implemented".to_string())
+    }
 }
 
 /// Registers the provided type as a Zed extension.
@@ -371,6 +381,14 @@ impl wit::Guest for Component {
     ) -> Result<(), String> {
         extension().index_docs(provider, package, database)
     }
+
+    fn get_dap_binary(
+        adapter_name: String,
+        config: DebugTaskDefinition,
+        user_installed_path: Option<String>,
+    ) -> Result<DebugAdapterBinary, String> {
+        extension().get_dap_binary(adapter_name, config, user_installed_path)
+    }
 }
 
 /// The ID of a language server.