Post Deactivation Intent

Creates a new unbond intent that opts out of the delegation program.
The user is getting back both their stake and the earned reward. The reward is sent immediately, but the stake gets locked for the so-called “unbonding period” of 2–3 days (or 80 Polygon checkpoints). Once the period is over, the user should call GET Deactivation Intents and POST Withdrawal Intent to actually get their stake back.