Clang/emscripten backend for XState configs

[agorikov]

Probably that is not a novel idea, probably it does exist. Idea: output Interpreter code ahead-of-time into a clang IL, with backends linkable into emscripten, webasm, C, Java etc.

[davidkpiano]

I think this is a great idea - we've thought about "transpiling" XState to a switch statement etc.