Make missing required fields required in date aggregates and group them

In Studio

• Create a page provider (PP)
• Add an aggregate
• Choose a date range or date histogram

=> Required fields are not marked as such but actually are
=> They may be lost in the options

DATE RANGE AC

• Make format field required
• If field is empty when I open the aggregate, set default value to MM/dd/yyyy
• If I erase the value, a placeholder is there: default: MM/dd/yyyy
• Move format field just below the "Field" option to group required config
• Make label for date ranges required (logic is here, just need the UI counterpart)

DATE HISTOGRAM AC

• Make format field required
  • If field is empty when I open the aggregate, set default value to month
  • If I erase the value, a placeholder is there: default: year, month, day...
  • Move format field just below the "Field" option to group required config
• Make interval field required
  • If field is empty when I open the aggregate, set default value to MMMM yyyy (4 M => month in letters yyyy year in numbers)
  • If I erase the value, a placeholder is there: default: yyyy, MMMM / MM, dd...
  • Move interval field just below the "format" field to group required config