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/Cargo.toml

@@ -20,6 +20,7 @@ path = "src/main.rs"
 
 [dependencies]
 activity_indicator.workspace = true
+acp_tools.workspace = true
 agent.workspace = true
 agent_ui.workspace = true
 agent_settings.workspace = true

crates/zed/src/main.rs

@@ -566,6 +566,7 @@ pub fn main() {
         language_models::init(app_state.user_store.clone(), app_state.client.clone(), cx);
         agent_settings::init(cx);
         agent_servers::init(cx);
+        acp_tools::init(cx);
         web_search::init(cx);
         web_search_providers::init(app_state.client.clone(), cx);
         snippet_provider::init(cx);

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"))]