embed() does not work with React 18

[sehilyi]

The error message when embed() is called:

Uncaught (in promise) TypeError: m.createRoot is not a function at createRoot

createRoot is only supported in React 18. But, we allow users to use either of React 16, 17, or 18. So, we will need to check the version of React that the user is using and call the proper function available.

gosling.js/src/core/gosling-embed.ts

Line 47 in bde823c

createRoot(element).render(component);