quickjs-emscripten

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• Enable malloc_usable_size and other previously linux-only features that Emscripten can actually emulate. This should improve memory accounting.
• Breaking: runtime.computeMemoryUsage() now directly returns a host Javascript object, instead of a handle. We no longer need a "system context" to pass the result back as a JSValue.
• remove runtime.getSystemContext() since it has no callers and is private
• Breaking: Use Emscripten STRICT=1 mode, dropping some properties previously exposed on the Emscripten module type
• Maybe breaking: Enable Emscripten WASM_BIGINT=1 mode, which may cause some internal functions to return bigint instead of number.

Fixes #206