Enter Estimated Payout Date

**User Story:**
As a funder
I want to set an estimated payout date
So that I can provide transparency on payment expectations to potential contributors

**Acceptance Criteria**

**Form Initiation**
GIVEN I am creating a bounty
WHEN I navigate to the Additional Information step of the new wizard
THEN I should see a date entry field for the Estimated Payout Date
AND this date should be required to be in the future

**Disable Estimated Payout Date**
GIVEAN i am creating a bounty
AND i am on the Additional information step
WHEN i set the "Set to never expire field" to true
THEN the Estimated Payout Date should be disabled
AND this field should remain disabled until "Set to never expire field" is set to false

**Product & Design Links:**
https://www.figma.com/file/8AFLrc4dx9xnMXUkWOAaAR/Existing-Bounties-Updates?node-id=33%3A1854

Start in the new bounty wizard's Additional Information step and review the linked product and design requirements. Add the Estimated Payout Date field, require a future date, and keep it disabled while "Set to never expire" is true; done means both acceptance-criteria flows work.

Written by the indexing model from the issue text.