Implement cliponaxis false for scattergeo

[etpinard]

Like #1861, but for scattergeo.

This will be a little bit work as scattergeo does not reuse scatter/plot.js.

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson