Keep ALPR marker state in a layer store instead of on Cesium entities

The ALPR layer's private per-entity fields (record, clamp, canvas and display
anchors, wedge, native appearance, pick position, shown, surface check) move
from gevAlpr* expandos into alprMarkers, a store made by the new
createEntityStore(). The shared entity records are built on the same factory.

scripts/package-boundaries.json

@@ -1957,6 +1957,7 @@
       "src/layers/alpr/presentation.js",
       "src/layers/alpr/visuals.js",
       "src/layers/alpr/overlay.js",
+      "src/layers/alpr/markerState.js",
       "src/layers/alpr/source.js",
       "src/data/inputOwnership.js",
       "src/layers/alpr/records.js",
@@ -2442,6 +2443,7 @@
       "src/layers/alpr/presentation.js",
       "src/layers/alpr/visuals.js",
       "src/layers/alpr/overlay.js",
+      "src/layers/alpr/markerState.js",
       "src/layers/alpr/source.js",
       "src/layers/awareness/controls.js",
       "src/layers/awareness/dependencies.js",
@@ -3347,6 +3349,7 @@
       "src/layers/alpr/presentation.js",
       "src/layers/alpr/visuals.js",
       "src/layers/alpr/overlay.js",
+      "src/layers/alpr/markerState.js",
       "src/layers/alpr/source.js",
       "src/layers/awareness/controls.js",
       "src/layers/awareness/dependencies.js",