[Feature Request] Add support for Zod date and time string validator in addition to datetime

[ErikDakoda]

Zod 3.23 added support for date and time string validators.

The z.string().date() method validates strings in the format YYYY-MM-DD.
The z.string().time() method validates strings in the format HH:MM:SS[.s+]. The second can include arbitrary decimal precision. It does not allow timezone offsets of any kind.

ZenStack does not currently support the following:

startDay String @db.VarChar(10) @date("Please enter a valid date")
startTime String @db.VarChar(12) @time(0, "Please enter a valid time")