ACP debug tools pane (#36768)

Adds a new "acp: open debug tools" action that opens a new workspace
item with a log of ACP messages for the active connection.

Release Notes:

- N/A

crates/zed/src/zed.rs

@@ -4434,6 +4434,7 @@ mod tests {
             assert_eq!(actions_without_namespace, Vec::<&str>::new());
 
             let expected_namespaces = vec![
+                "acp",
                 "activity_indicator",
                 "agent",
                 #[cfg(not(target_os = "macos"))]