[Wasm] Implement secure random generator #2240
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Fixes #2220
Emscripten already uses random API (via
getRandomDevice) available on Browser or Node, see https://github.com/emscripten-core/emscripten/blob/main/src/library.js#L2204What we do here is simple, we wrap
std::random_devicewithstd::mt19937and return a random uint32 value, inspired by emscripten-core/emscripten#12240