Change Elements SDK dependency

[antelopeb]

Right now we are pulling it in via an import statement on the component. This causes the Elements SDK to get pulled in via a <style> tag in the head. This is a bad use case for most teams in that they are already pulling in Elements SDK and therefore get multiple copies of it.

Let's change that methodology to insist that the team pulling it in has to have Elements on the page, rather then calling it in via an import statement.