Decorator less addons (experiment on KNOBS)

[alexandrebodin]

What I did

I started experimenting with decoratorless addons after a discussion with @ndelangen.

I tried it out and could knobs "work" (only updating values no reset etc) with a decorator.

I think that's pretty cool, and we should maybe add it to the api somehow as a good practice pattern.

My opinion is that with such an approach. We can lift the refreshing need etc in the api and let user use our addons without too much thinking.

If they really need a decorator that should be for a specific use case (theme etc) that maybe we should let the user handle on it's own.

This is just an experiment but might be worse thinking about for the addon api v2 😄

[storybookbot]

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[shilman]

Wow. This is really cool! Though i think I still prefer a decorated version that doesn't use context :)

[ndelangen]

I'll close the PR, please re-open when development continues.