Add TextureView for mip level and array layer access in compute shaders

[mvaligursky]

Fixes #7872

Adds support for binding specific mip levels and array layers of textures in compute shaders via a new TextureView class.

Features

• New TextureView class representing a view into a subset of a texture (WebGPU only)
• Texture.getView() factory method for creating views
• Support for specifying baseMipLevel, mipLevelCount, baseArrayLayer, and arrayLayerCount

Usage

// Create views for specific mip levels
const mip0View = texture.getView(0);
const mip1View = texture.getView(1);

// Use with compute shader (e.g., HZB generation)
compute.setParameter('srcTexture', mip0View);
compute.setParameter('destTexture', mip1View);