[feat] add createEffect fn

[e-oz]

Don't you mind if I'll add this function?
https://gist.github.com/e-oz/62fed6d626df5fab5e34402b5f6ec06e
It's a standalone port of ComponentStore.effect() method, with 1 modification: it re-subscribes on errors.
Or you could add it yourself (it would be faster, I think), because the original function is not mine anyway so I'm not looking for any credit for that small modification :)

[nartc]

Go for it!

[dmorosinotto]

I was suggesting the same function from your article @e-oz 😉