Revert "add back Command.async_basic"

Upstream added it back too, so undoing this one to avoid patch conflicts

This reverts commit 7ad634c7dcfc02f6a83334f9d612861597b91c24.
111.21.00

- Added `Sexp_hum` `Log.Output.format`, which is useful for making logs
  more human readable.
- Added `with compare` to `Rpc.Implementation.Description`.