Use of class deviates from standard React practice

[stevenvachon]

Per #865, class was defined instead of className. It's also causing issues with Enzyme's hasClass method.

[texodus]

Thanks for the report!

This is correct. The root issue IMO is incomplete Web Component support in React itself, as I alluded to here. I'm unclear of how to resolve this without writing a custom React wrapper around <perspective-viewer>, which seems like a bit of overkill perhaps (suggestions are welcome!). Let me do a bit of research on this and see if there is a pattern we can follow from other Web Component libraries, otherwise we'll look into publishing a @finos/perspective-viewer-react.