feat: add bike-share and transit tools

Add get_bike_share over the public GBFS systems and get_transit_vehicles
over the GTFS-Realtime feeds. Each finds the systems or feeds whose
coverage reaches the area, reads up to three, and reports any that were
unavailable instead of failing the whole answer. Transit results carry
each feed's attribution and license.

scripts/package-boundaries.json

@@ -3093,6 +3093,8 @@
       "src/tools/queries/aviation.js",
       "src/tools/queries/media.js",
       "src/tools/queries/places.js",
+      "src/tools/queries/mobility.js",
+      "src/sources/gbfsStations.js",
       "src/sources/tle.js",
       "src/data/satellitePass.js"
     ],