wasm-webgpu: use emscripten APIs instead of SDL2
Refactors the webassembly webgpu render window to use emscripten's html5.h and html_webgpu.h. It now calls into emscripten_* APIs to create a surface and resize window.
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Refactors the webassembly webgpu render window to use emscripten's html5.h and html_webgpu.h. It now calls into emscripten_* APIs to create a surface and resize window.