The destroy method of Custom Shader should be public

[anne-gropler]

As stated by the CustomShader docs:

CustomShader#destroy must be called when the custom shader is no longer needed to clean up GPU resources properly. The application is responsible for calling this method.

However, the destroy method is not part of the public interface, which is especially troublesome when using typescript.

The current workaround in typescript is to annotate the customShader with as any:
(model.customShader as any).destroy();

I understand that the CustomShader is still experimental, but since the documentation is clear about destroy, I expected the API to reflect that.