The collector now collects the body of functions that return an
expression as a symbolic 'function'. The static reflector supports
expanding these functions statically to allow provider macros.
Also added support for the array spread operator in both the
collector and the static reflector.
It is now possible to set a fallback state that will apply its
styling when the destination state is not detected.
```ts
state("*", style({ ... }))
```
Closes#9013
Misko Hevery
Chuck Jazdzewski
Matias Niemelä
Alex Eagle
Victor Berchet