Evaluate technical options and decide on one.

Current caveat: We merely expect form items to be JcrNewNodeAdapter to apply default values.

• doesn't work for nodes created "upfront" (e.g. page or optional area nodes, as opposed to component nodes)
• doesn't apply very well to non-JCR content:
  • see the dirty logic in info.magnolia.ui.form.field.factory.AbstractFieldFactory#setPropertyDataSourceAndDefaultValue
  • see info.magnolia.ui.vaadin.integration.ItemAdapter#isNew

Possible options:

1. Use some metadata to denote an "autogenerated" node, that has not been edited yet
2. Compare createdDate and lastModifiedDate (careful about shortcomings)
3. Denote at UI-framework/API level when a form/dialog should be presented as 'new'
   • as opposed to the first two options, it would not apply only to JCR