Update WebGPU to latest Emscripten/Dawn API (#7804)

* Update WebGPU to latest Emscripten/Dawn API

- Updated mini_webgpu.h to be in sync with Dawn as of commit ded6610f45a8826db37b52d73121a66b74d8aa61
- Updated the use of SetDeviceLost callbacks to be in the DeviceDescriptor instead of a separate call
- Updated a couple of fields that got renamed
- Update webgpu.cpp and gpu_context.h to always use wgpuCreateInstance() and wgpuInstanceRelease(), since the Dawn node bindings now support & require them

* clang-tidy

Author: steven-johnson