support different model styles for the structure, e.g. Sphere, Ball-and-Stick

[cpignedoli]

I am working on it migrating what we did for the empa_viewer, I will need the help of @yakutovicha to finalize it

[superstar54]

Thanks for implementing this. Please assign me as a reviewer when done. I am interested in it.

[danielhollas]

@cpignedoli would you mind tagging me for review as well? I am interested specifically in the render performance of your solution. In the current code, the style is reapplied upon each render, which makes it very janky when quickly switching between structures (in my case I am working on the TrajectoryViewer, where this is critical). Thanks!

[cpignedoli]

more than happy to have you all @superstar54 @danielhollas on board :) but I can anticipate that what was in empa_viewer was not really performant
https://github.com/nanotech-empa/aiidalab-empa-surfaces/blob/318670658e7e7d090e9c84dac53626bca8b9a638/widgets/empa_viewer.py#L161