Provide widget options to select the select type and allow select2

Problem/Motivation

When using the field widget, the only available field type is a select field. We wish to also allow select2 as a select type.

Steps to reproduce

None.

Proposed resolution

Allow to select a different select type and allow select2 when the module is available.

Remaining tasks

• Review patch

User interface changes

The webmaster is able to set the select type for the field widget.

API changes

None.

Data model changes

New schema for the select type for the field widget.