Add field validation handlers to ensure field validation when contents are created outside the UI

[MikeAlhayek]

Is your feature request related to a problem? Please describe.

Recently IContentFieldHandler interface was added which allow us to add field level handlers. The following fields should have handler to handle the validation of each field. The same validation rules we have in the driver should apply.

Describe the solution you'd like

Here is a list of the fields that need handler to validate them

• ContentPickerField
• DateField
• DateTimeField
• TimeField
• LinkField
• LocalizationSetContentPickerField
• MultiTextField
• TextField
• UserPickerField
• YoutubeField
• GeoPointField
• TaxonomyField