Add validation in accordance with WebGPU GPUSamplerDescriptor valid…

[James2022-rgb]

… usage for lodMinClamp and lodMaxClamp.

lodMinClamp must not be negative, and lodMaxClamp must be >= lodMinClamp

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
  Done just in case, with --feature gles.
• Add change to CHANGELOG.md. See simple instructions inside file.

Description
For wgpu::SamplerDescriptor, it was possible to use values for lod_min_clamp and lod_max_clamp such that:

• lod_min_clamp is negative
• lod_max_clamp < lod_min_clamp

both of which are in violation of the valid usage defined for GPUSamplerDescriptor in the WebGPU spec:

descriptor.lodMinClamp ≥ 0.
descriptor.lodMaxClamp ≥ descriptor.lodMinClamp.

This PR adds InvalidLodClamp to CreateSamplerError, inspired by the already-existing InvalidClamp, and uses that if the validation fails.

Testing
Tested locally.

[nical]

Thanks! Almost good to go, but the CI is complaining about formatting so it looks like you need to cargo fmt the PR.

[James2022-rgb]

Done!