Set the lat/lon coordinate of a view

[deeplook]

Maybe it's just not so obvious to me, but I'm missing a feature for setting the lat/lon coordinate and have the map/globe view center on it like with map.center = (lat, lon) in ipyleaflet.

[davidbrochart]

I don't think this feature exists yet.
I don't know if I should keep on working on IPyEarth or if it should be part of bqplot. I submitted a PR in that direction (bqplot/bqplot#705) but it doesn't seem to get a lot of interest.
@SylvainCorlay what do you think?