Add no macro async blinky code example

[katusk]

I was curious how to make statig work without the macros for async code. Since such an example was missing, I simply created one based on the already existing "async blinky using macros" and (non-async) "blinky using no macros" examples. Hope I nailed the intended usage.

I have one question, lines like context: &mut <Blinky as IntoStateMachine>::Context<'_>, -- the as IntoStateMachine part to be more specific -- bug me a bit, do you think there is a way to make this example somehow compile without the as part or with a different approach? Thanks.