Expose the autocomplete attribute in Web UI default widgets

Related to WCAG 2.1 criteria 1.3.5 level AA: Identify input purpose.
https://www.w3.org/TR/WCAG21/#identify-input-purpose

A sufficient technique to validate this criteria is to expose the "autocomplete" attribute in our widgets.
https://www.w3.org/WAI/WCAG21/Techniques/html/H98

This attribute is supported by widgets we derive nuxeo elements from, at least the core polymer ones:
https://www.webcomponents.org/element/PolymerElements/paper-input/elements/paper-input#property-autocomplete

GOAL
With this ticket, we should review our existing set of widgets and make sure they expose the autocomplete attribute or provide it when missing.
This attribute should be configurable with Studio.