Adding Cluster HoverData

[BSd3v]

Adding hover and click data to clusters for maps.

It currently only emits the plotly_hover and plotly_click events, instead of providing the hoverData directly on screen, automatically.

Looking for feedback and assistance with how to get the hoverData to show.

@alexcjohnson

[archmoj]

Thanks very much for the PR.
Please add draftlogs/7297_fix.md for this PR as described here.

Please add a jasmine test in test/jasmine/tests/map_test.js for this feature as well.

Wondering if this fix may also be applied to mapbox?

[BSd3v]

@archmoj,

I believe that this can be applied to mapbox as well. From my understanding, it seems that map is an offshoot of mapbox.

[archmoj]

@archmoj,

I believe that this can be applied to mapbox as well. From my understanding, it seems that map is an offshoot of mapbox.

That's true.
Although the mapbox traces would be removed in plotly.js v4, having this change for mapbox would be nice IMHO. cc: @gvwilson @ndrezn

BTW Let's start by adding the tests to map first.
Thank you @BSd3v