Geo v2

Continued work of original Geo PR, as well as additional examples / features from the original issue.

• Zoom
  • fix fitGeojson integration (or replace with initialTranslate/Scale/etc)
    • Integrated TransformContext along with Chart's fitGeoObject
  • Seamless zoomable map tiles
  • scale/translate extents (max zoom, scroll, etc)
    • extent
    • constrain
    • scaleExtent
    • translateExtent
• Map tiles
  • Better implementation using canvas and caching Image instances
    • See tile-rack from Globlet
  • Support showing lower quality images while higher quality are loading
  • Edge buffer
    • http://www.tolon.co.uk/Leaflet.EdgeBuffer/comparison.html
  • Tile wrap
    • https://observablehq.com/@d3/wrapped-tiles?collection=@d3/d3-tile
  • Vector tiles
    • https://docs.mapbox.com/data/tilesets/guides/vector-tiles-standards/
    • https://observablehq.com/@d3/mapbox-vector-tiles
    • https://observablehq.com/@gallowayevan/life-expectancy
• HexBin/Grid
  • https://observablehq.com/@d3/hexbin-map
  • https://observablehq.com/@larsvers/hexgrid-maps-with-d3-hexgrid?collection=@observablehq/maps
• GeoPoint
  • Overlay data on a pre-projected map (geoAlbersUsa with geoIdentity)
    • Consider pre-projecting the data first

Start by reviewing the original PR #36 and issue #19, then use the unchecked items in the Zoom, Map tiles, and GeoPoint sections to identify a narrowly scoped task. The issue does not name files, tests, or a single completion criterion, so confirm the chosen scope and expected examples before starting.