Image's texture view should be a separate asset

## What problem does this solve or what need does it fill?

Currently Image/GpuImage contains one texture created from image data, and one texture view created with texture view descriptor, therefore you have to clone the Image to create new `Handle`s to use different texture views, such as using different srgb format or view dimension, using a 2d slice from texture array or mipmaps, or swizzling channels (The incoming `texture-component-swizzle` feature).

But the cloning is unnecessary and expensive. The underlying wgpu API allows you create different views from the same texture.

## What solution would you like?

Split Image into two assets: Image, and ImageView which depends on a `Handle`. Then Replace all `Handle` with `Handle` in components that need an image.

## What alternative(s) have you considered?

No