Support wgpu-tracing with same mechanism as wgpu examples #5450
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Gets the WGPU_TRACE env variable and gives it as an optional argument
to request_device. Same mechanism as the wgpu-examples:
https://github.com/gfx-rs/wgpu/blob/11b51693d3dc883b55b5ec0e30c340e43e6fac50/examples/src/framework.rs#L316