Feature suggestion, integration with gggenes

Hey folks,

First of all, thank you so much for the library!

This is rather a feature suggestion than an issue, I wonder if you could implement wrappers to integrate gggenes library (https://wilkox.org/gggenes/) with plotly. I really need an interactive versions of genome annotation graphs.

Code I used.

p <- ggplot(phage_genes, aes(xmin = start, xmax = end, y = molecule)) +
  facet_wrap(~ molecule, scales = "free", ncol = 1) +
  geom_gene_arrow(fill = "grey") +
  geom_subgene_arrow(data = phage_annotations,
                     aes(xmin = start, xmax = end, y = molecule, fill = subgene,
                         xsubmin = from, xsubmax = to), color="black", alpha=.7) +
  labs(y='Genome ID', fill='Annotation ID', color=" ", shape=" ")+
  theme_genes() 

ggplotly(p)

Currently, it returns these errors:

  https://github.com/ropensci/plotly/issuesWarning: geom_GeomSubgeneArrow() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at

  https://github.com/ropensci/plotly/issuesWarning: geom_GeomGeneArrow() has yet to be implemented in plotly.
  If you'd like to see this geom implemented,
  Please open an issue with your example code at
  https://github.com/ropensci/plotly/issuesWarning

Start by reproducing the supplied R example using gggenes and ggplotly, focusing on geom_GeneArrow and geom_SubgeneArrow. Trace how existing ggplot geoms are handled in plotly.R. Done means the example produces an interactive genome annotation graph without either unimplemented-geom warning.