Date question min, max configuration

[Yelinz]

Implement min_date and max_date configurations from flatpickr.
Would also need some small changes in caluma

[anehx]

Use cases I can think of:

• min/max date x days/months/years in the future / past from now
• min/max date x days/months/years in the future / past from another date field
• fixed date (edge case IMO)

So in my opinion this configuration should be JEXL fields with a couple of transforms to alter dates e.g.:

• today (context, not transform)
• |plus({ days: 1, months: 2, years: 3 }) (naming from luxon API)
• |minus({ days: 1, months: 2, years: 3 }) (naming from luxon API)

So you could do stuff like:

• "my-other-date-field"|answer|plus({ days: 5 })
• today|minus({ months: 1 })