Initial groundwork in creating WebGPU backend components, namely
the instance, adapter, device, and queue.
If configured to do so, the backend will print out details about
these components.
The samples/hellotriangle.cpp was slightly modified to include a
webgpu option which allows for exercising the above, but does not
yet draw anything to the screen/window.
NOTE: This has only been sanity tested with hello triangle
on Mac OS and the Android emulator at this time, NOT IOS,
Windows, or Linux yet.
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