Share a scene's camera-input holds beyond the dispatcher

The take-over of the camera controller's enableInputs moves, unchanged,
to src/render/cesium/cameraInput.js. acquireCameraInput(scene) gives every
user one set of counted holds per scene, so the renderer's input and
camera ports can hold camera input alongside the dispatcher; the
controller gets its own property back when the last user releases. The
dispatcher acquires its share once its handler is bound. The input guard
names the one module allowed to write the flag, and the new render files
join the format scope.

scripts/format-scope.json

@@ -49,6 +49,10 @@
   "src/input/dispatcher.js",
   "src/queries/heights.js",
   "src/render/cesium/internals.js",
+  "src/render/cesium/cameraInput.js",
+  "src/render/cesium/cameraInput.test.mjs",
+  "src/render/input/router.js",
+  "src/render/input/router.test.mjs",
   "src/render/cesium/internals.test.mjs",
   "src/render/cesium/tileRequests.js",
   "src/render/cesium/tileRequests.test.mjs",