Add support for ggrepel::geom_text_repel labels

[CristianRiccio]

I would like to produce a scatter plot in HTML format where labels are associated with each point.

This works well when I export the plot in PDF or PNG format:

But my HTML does not have the labels associated with each point. The warning message suggests that plotly does not support the label geometry from the ggrepel package:

Would someone be so kind so add support for this function, please?

data(iris)

library(ggplot2)
library(htmlwidgets)
library(plotly)

p <- ggplot2::ggplot(iris, ggplot2::aes(x = Sepal.Length, y = Petal.Length)) +
  ggplot2::geom_point() +
  ggrepel::geom_text_repel(ggplot2::aes(label = Species)) +
  ggplot2::theme_classic()
ggplot2::ggsave('output/plot/point/example_repel_labels.pdf', p, height = 15, width = 15)
ggplot2::ggsave('output/plot/point/example_repel_labels.png', p, height = 15, width = 15)
pPlotly <- plotly::ggplotly(p)
htmlwidgets::saveWidget(pPlotly, 'output/plot/point/example_repel_labels.html')

Output:
Warning message: In geom2trace.default(dots[[1L]][[1L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) : geom_GeomTextRepel() 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/issues