Code Component Editor: Add a Date (and maybe also a DateTime) prop type(s)

Overview

SDC's allow props with schema: type: string, format: date or type: string, format: date-time, but neither of these are currently included in the Type drop-down when defining props in the Code Component Editor.

It would be good to allow Code Components to receive date props, which would enable a content editor to populate it statically with a calendar widget or dynamically by linking to a date field that's on the node.

Proposed resolution

• Add a Date option in the Type drop-down.
• Possibly also add a "Date and time" option, or include that as a separate checkbox for the Date option, or punt on date-time to a follow-up if we want to think more about whether to make it a separate top-level type choice or a sub-choice of Date.

User interface changes

New option(s) added to the Type drop-down.