The list widget allows you to create a repeatable item in the UI which saves as a list of widget values. map a user-provided string with a comma delimiter into a list. You can choose any widget as a child of a list widget—even other lists.
* **Name:** `list`
* **UI:** without any `fields` specified, the list widget defaults to a text input for entering comma-separated values; with `fields` specified, the list widget contains a repeatable child widget, with controls for adding, deleting, and re-ordering the repeated widgets.
* **Data type:** list of widget values
* **Options:**
* `default`: you may specify a list of strings to populate the basic text
field, or an array of list items for lists using the `fields` option. If no
default is declared when using `field` or `fields`, will default to a single
list item using the defaults on the child widgets
* `allow_add`: `false` hides the button to add additional items
* `collapsed`: when `true`, the entries collapse by default
* `summary`: specify the label displayed on collapsed entries
* `minimize_collapsed`: when `true`, collapsing the list widget will hide all of it's entries instead of showing summaries
* `label_singular`: the text to show on the add button
* `field`: a single widget field to be repeated
* `fields`: a nested list of multiple widget fields to be included in each repeatable iteration
* `max`: maximum number of items in the list
* `min`: minimum number of items in the list
* `add_to_top`: when `true`, new entries will be added to the top of the list