[NcActions] enh: add `wide` setting like for NcButton

[Chartman123]

We're using NcActions in Forms between two questions to insert a new question at that place. For better accessibility Nimisha proposed to make the button the whole width of the column, especially if it's an icon-only button without menuName set.

Currently we added a menuName so that the button is larger, but icon-only would be our preferred way.

[ShGKme]

Could you add a reference to the Forms issue to see how it is supposed to be used?

[Chartman123]

We don't have a separate issue for this in Forms, but you can see it in the PR

nextcloud/forms#3360

Currently we use '+ Insert question' on the button to make it larger, but we'd like to have a full-width button with only '+'.