Aggregate and bundle only JavaScript with defer without forcing all to defer?

I suppose we would require the patch from 🐛 JavaScript aggregation should account for "async" and "defer" attributes Needs work if we want to be able to use this patch without having to force processing on every script.

I tried to reroll #5 on advagg 6.0 but could not get it to work.
I get an error "array_chunk(): Argument #2 ($length) must be greater than 0" when $split has a value of 0.

In ✨ advagg_bundler should group assets with the same fetchpriority together Needs review I am trying a simpler approach based on how the browsers property is handled.