[Feat] Unlocked split map viewports

[igorDykhta]

PR Changes

• Adds the ability to have "unsynced" viewports when in split map mode. They can also optionally be set to lock to each other's zooms (regardless of lat/lon or 3D pitch, bearing, etc).
• New switch toggle controls for this were added to the legend panel.
• Works in 2D/3D.
• Changes MapPopover behavior to only ever show 1 instance of the MapPopover. It is only shown in the map that the mouse is hovering over, regardless of split map mode or single map mode.
• Adds dual geocoders for split + unsynced viewports.

[jwasilgeo]

Thanks for bringing this one in, @igorDykhta. When I test the deployed PR demo or run it locally myself, I can't get these conditional controls to render. If I force this to true it would look like this in a split maps view:

I'm not sure why yet, but in the demo app code it seems like the parents of this component might now be passing around props that are a flattened mapState instead of when this was originally written to pass in the full mapState. 🤔 Either way, mapState seems to evaluate to undefined now when I try to debug.

[igorDykhta]

@jwasilgeo yes, I know about this.

[igorDykhta]

@jwasilgeo should be fixed

[jwasilgeo]

Looks great when I try it locally. Thanks!