Cameron Woodbury

Fixes lack of `ImageryLayer` recreation on `imageryProvider` prop update by adding it to the `cesiumReadonlyProps` array, which is where it belongs according to the [Cesium](https://cesium.com/learn/cesiumjs/ref-doc/ImageryLayer.html#imageryProvider) and [Resium](https://resium.reearth.io/components/ImageryLayer#cesium-read-only-properties) documentation. Resolves reearth/resium#664...

# Overview The [Resium docs](https://resium.reearth.io/components/ImageryLayer#cesium-read-only-properties) and [Cesium docs](https://cesium.com/learn/cesiumjs/ref-doc/ImageryLayer.html#imageryProvider) agree that `ImageryLayer#imageryProvider` is a readonly property. It appears that Resium does not accurately respect that, and as a result the `ImageryLayer`...