#3598994 Date/time field exposure

Pieter Frenssenrequested to merge
issue/graphql_webform-3598994:3598994-datetime-field-exposure into 3.x

Expose the configuration of the date and time element family (date, time, datetime, datelist) for querying:

  • time min / max / step
  • date native-input attributes (placeholder, step, autocomplete, size)
  • datelist part order, text parts, year range, increment, abbreviation and per-part title display
  • datetime date/time element modes, year range, formats, placeholders and time bounds

Backed by four new enums (WebformDatePart, WebformDatePartTitleDisplay, WebformDatetimeDateElement, WebformDatetimeTimeElement). Additive only; submission parsing for these elements is split to #3599000.

Closes #3598994

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