Add GetImageInfo (or equivalent) in SDKv2 in DOMinstance

[yannloosli]

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Summary

I've made a plugin which enable the user to use the C3 image editor and then send the image to a third party library (LeafletJs) in the DOM. In V1, although it was outside the recommandation, image data (C3 internal url) were available.

Possible workarounds or alternatives

I have tried to use project file although it's less natural in the workflow. (And I can't even tell if it works as I'm stuck with another problem).

Proposed solution

Even if undocumented in V1, I could get this key and the _url of the image that I then sent DOM side. That's all I need.

Why is this idea important?

Being able to use C3 image editor to edit image that will be use in DOM is very important IMO. It provides a smoother experience and the user shouldn't even bother that we use DOM elements...

Additional remarks

No response