ModalSelect Form Field
TODO: THIS NEEDS COMPLETING
The modalselect form field type provides a pop up modal window displaying content and a selection field that can have specific actions such as select, edit, new.
It appears to be used as an inherited field within component development rather than in a .xml form definition.
See https://magazine.joomla.org/all-issues/january-2024/creating-a-custom-form-field-type-in-joomla-5-using-the-modal-select-example for more information
Implemented by: libraries/src/Form/Field/ModalSelectField.php