Feature: #61351 - Add data attribute to Fluid ViewHelpers

See forge#61351


Since HTML5 Elements can contain a generic data attribute, Fluid provides for those elements the possibility to add key-value pairs as array, which will be rendered as data-$key="$value".

<f:form.textfield data="{foo: 'bar', baz: 'foos'}" />


Generic data attributes do not need to be passed by the additionalAttributes array anymore making the viewhelper more straightforward to use.