Consider conversion of `data-`/`aria-` prefixed keys to nested variants

[peteryates]

In Rails there are two ways of setting data and aria attributes when using the tag and content_tag helpers. These are to set the attribute by its full name data-controller: "abc", data-response: "xyz" or to use a nested hash: data: { controller: "abc", response: "xyz" }.This library, and both the components and form builder assume people are using the latter. Using the former might lead to unintended consequences.

It might make sense to detect the full name variant and either apply a conversion or provide some kind of warning to the developer. As this only applies to data- and aria- prefixed attributes the conversion should be straightforward.