add HTML data attribute to avatar wrapper

[theMasix]

Hello. I wanna add HTML data attribute to the avatar wrapper that has sb-avatar class. How could I do this? Is there any way to pass data attribute to Avatar component?

[JorgenEvens]

Related to #212.

This is not possible currently, but as discussed in the mentioned pull request I'll be separating the rendering of the Avatar from the retrieval of avatar pictures which should also make your use-case possible.