`createTextureView` allows sampling multiple mip-range views of one texture, which is impossible with the OpenGL rendering backend

GpuDevice.createTextureView(texture, baseMipLevel, mipLevels) lets you build independent views of the same texture, each with its own mip sub-range, and bind them as samplers at the same time. On Vulkan each becomes a real VkImageView, so the ranges are carried per view and stay independent. With OpenGL backend there is no per-view object: the mip range is state on the texture object (GL_TEXTURE_BASE_LEVEL / MAX_LEVEL), which GlCommandEncoder writes when the sampler is set up. Two views of the same texture with different ranges therefore cannot coexist as samplers, the last bind overwrites the other. So the abstraction accepts a configuration the OpenGL backend cannot honor, silently diverging from Vulkan