Change list

• Adds definitions for map "controls" (which deck.gl calls "widgets", but the name "widget" is too overloaded in the context of Jupyter, so I'd like to call them "controls")
• Support for ScaleControl, NavigationControl, FullscreenControl
• These controls are supported by both deck.gl and maplibre, and so implementations are defined for creating both the deck.gl and maplibre counterparts

Example

from lonboard import Map
from lonboard.controls import ScaleControl, FullscreenControl, NavigationControl
from lonboard.basemap import MaplibreBasemap

m = Map([], 
    basemap=MaplibreBasemap(mode="overlaid"),
    controls=[ScaleControl(), FullscreenControl(), NavigationControl()]
)
m

We should probably change the default positioning of controls, move the bbox selector, or make the bbox selector a control itself.

However, for deck.gl-driven rendering, I can only see the scale control:

Todo list

• Figure out how to pass these react components as children of the OverlayRenderer or DeckFirstRenderer (depends on feat: Support two render modes: Standard/deck.gl-first and MapboxOverlay #921)
• Use the refactored model initialization from refactor: Refactor model initialization logic #923 to create the list of control instances on the deck side
• Integrate more cleanly into the Python API (an extension of feat: Support globe view #908)

Closes #842, relevant to #681