Add the `inert` boolean attribute to the global HTML attribute
group and to the SSR boolean attributes list. This allows users
to set `inert` on any HTML element, matching the HTML spec.
Fixes#5455
* feat: add blanket IntoAttributeValue impl for references
Adds `impl<T: IntoAttributeValue + Clone> IntoAttributeValue for &T` so
users don't need to explicitly dereference or clone when passing references
to RSX attributes.
Closes#5444
* use to-owned
---------
Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>