[Add forge now] Design a feedback tracking solution

find an automation mechanism for feedback loop (API)

the request state change between waiting_for_feedback and feedback_to_handle must be automated :

from \ to	waiting_for_feedback	feedback_to_handle
waiting_for_feedback	x	email received from forge
feedback_to_handle	send message/reply to forge	x

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Migrated from T3999 (view on Phabricator)