Allow loading WebAssembly scripts when in node environment

[RaananW]

When running Babylon.js in Node.js it is not enough to load the wasm, as it is required to use Node.js' WebAssembly runtime to parse the file (https://nodejs.dev/en/learn/nodejs-with-webassembly/). We will need to find a clean way to introduce file loading in different environments.

See discussion here - https://forum.babylonjs.com/t/importasyncmesh-on-server-side-without-scene/34151/39

[RaananW]

An acceptable solution for node:

https://forum.babylonjs.com/t/running-nullengine-in-node-js-to-leverage-the-havok-physics-engine/41424/7

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