Pull action_log into its own crate (#35959)

Release Notes:

- N/A

crates/acp_thread/Cargo.toml

@@ -16,9 +16,9 @@ doctest = false
 test-support = ["gpui/test-support", "project/test-support"]
 
 [dependencies]
+action_log.workspace = true
 agent-client-protocol.workspace = true
 anyhow.workspace = true
-assistant_tool.workspace = true
 buffer_diff.workspace = true
 editor.workspace = true
 futures.workspace = true