doc: add snippet for AsyncResource and EE integration

PR-URL: https://github.com/nodejs/node/pull/33751


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Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
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Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>