feat: add weather map and wind tools

Add get_weather_map, which returns the latest NOAA radar, satellite or
lightning map over an area as an image, choosing a window the image
route accepts and reporting areas outside the product's coverage, and
get_wind, which samples GFS or IFS wind at a location with the wind
layer's own grid sampling.

docs/CURRENT-STATE.md

@@ -13,7 +13,8 @@ area, by identifier, tracks, and type and route lookups), ships (in an area,
 by identifier, and tracks), satellites (next
 pass over a point, and those overhead now), public cameras (including a
 camera's current image), radio stations, place search, routing, bike-share
-stations, transit vehicles, road traffic flow, weather, regional briefs, tropical cyclones, fire
+stations, transit vehicles, road traffic flow, weather, weather map images
+(radar, satellite, lightning), wind, regional briefs, tropical cyclones, fire
 perimeters, terrain height, military installations and map features, plus a
 combined situation brief, the app's heads-up display caption, and a link that
 opens the app over an area. Tools reuse the layers' portable source factories, take a