refactor: viewerProperty

[airslice]

Overview

This PR refactors the interface of viewerProperty (it was called sceneProperty).

ViewerProperty keeps the original idea as enable core user to config the map through props.
At the same time core context still provide the override function and overridden property.

New ViewerProperty is re-organized with these ideas:

• Re-group with clearfied scopes.
• Consistent naming convertions.
• Simplify complex types.

This PR has some other refactor as well:

• Override & overridden of scene property is removed.
• Split some hooks for Cesium.
• Expose a simple reearth_core to window, which contains a version and a property property to help developers check current running core version and setted viewer properties.

Breaking Changes

• CoreVisualizer
  • Property sceneProperty is removed. Please use new viewerProperty instead.
  • Added one new property time.
• CoreContext
  • Property overriddenSceneProperty is removed. Please use new overriddenViewerProperty instead.
  • Function overrideSceneProperty is removed. Please use new overrideViewerProperty instead.
• ViewerProperty
  • Interface is different with the sceneProperty. Please refer the new structure.
  • timeline is removed. Please use CoreVisualizer's time to set the time, and use timelineManagerRef from visualizerRef to handle all the updates.

Todo

I didn't remove camera from viewerProperty but i think maybe we should do that as well.