Add support for Element Modifiers

**Is your feature request related to a problem? Please describe.**
Ember Inspector doesn't support showing Element Modifiers. See https://github.com/emberjs/rfcs/pull/934 for context.

**Describe the solution you'd like**
To be able to see Element Modifiers in the component view.

**Describe alternatives you've considered**
N/A

**Additional context**
N/A
