Change signature of Prism.highlight{Element,All,AllUnder}

[RunDevelopment]

Motivation
Similar to #3416, it would be nice to have all optional arguments of Prism.highlight{Element,All,AllUnder} in an options dictionary.

Description
So the new signature should be:

(Updated after the below discussion)

interface HighlightAllOptions {
  root?: Element;
  async?: boolean;
  callback?: (element: Element) => void;
}
function highlightAll(options?: HighlightAllOptions) { ... } 

interface HighlightElementOptions {
  async?: boolean;
  callback?: (element: Element) => void;
}
function highlightElement(element: T, options?: HighlightElementOptions) { ... }

Example usage:

Prism.highlightAll({ root: document.querySelector("#page") })

Thoughts? @LeaVerou @Golmote @mAAdhaTTah @JaKXz

[LeaVerou]

Yes, agreed with removing highlightAllUnder() and making it an option in highlightAll(). Wrt naming, I think container is more common. Maybe also root?

[JaKXz]

I think root is probably the most ubiquitous / broadly accepted :)

[RunDevelopment]

Agreed. root sounds good.

[RunDevelopment]

Implemented in v2.