We cannot update or delete texture/cube texture object

[KaYaF]

There is no update and delete methods in the Texture / CubeTexture class.
This means a waste of memory. A Texture object once created will not be erased by GC because it inherits from RnObject, and the WebGLTexture registered by the Texture object will not be deleted.

I think we should introduce the update and delete method in the Texture / CubeTexture class.

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