Add Amsterdam traffic and ANPR camera positions to the Data Library

The City of Amsterdam's verkeersinformatiesystemen register lists where
its ~500 traffic and ANPR cameras stand, with type and asset number, but
publishes no pictures. That fits a Data Library dataset better than a
CCTV pack: the register answers GeoJSON in WGS84 with CORS headers, so
the entry fetches it browser-direct with no proxy code.

The register names no licence ("public unless stated otherwise"), so the
entry stays operator opt-in, as #251 had it. The dataset and the
position-only camera idea come from @Maher-Reven's #251, which this
replaces; the entry lists them as maintainer and in its attribution.

Co-authored-by: Maher Kurdi <[email protected]>

scripts/package-boundaries.json

@@ -3213,6 +3213,7 @@
       "src/library/selection.js",
       "src/library/ledger.json",
       "src/library/entries/ak-statewide-imagery.json",
+      "src/library/entries/amsterdam-traffic-cameras.json",
       "src/library/entries/ar-statewide-imagery.json",
       "src/library/entries/az-statewide-imagery.json",
       "src/library/entries/bangor-me.json",