Enhancement: Allow to define the date format on the field

[estruyf]

Right now, you can only define the date format Front Matter uses at the global level with the frontMatter.taxonomy.dateFormat setting.

In the following Discord thread: https://discord.com/channels/992409023607476224/1120978270565978174 - Llamanat3r opted to have the option on field level.

[estruyf]

A new dateFormat property got added to the datetime field.

Example:

{
  "title": "Date only",
  "name": "dateOnly",
  "type": "datetime",
  "default": "{{now}}",
  "dateFormat": "yyyy-MM-dd"
}