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