FYI - Experimenting with wasm support via Node.js

As an FYI I've been experimenting with wasm support via Node.js in a similar manner to how it is provided with wasmtime, wasmedge etc.

My experiement is here: https://github.com/mhdawson/crun/tree/node-wasm-experiment

An overview of how to build and try it out is in: https://github.com/mhdawson/crun/blob/node-wasm-experiment/NODE-WASM_EXPERIMENT.md

It's uses code from a PR not landed yet in Node.js since the Node.js embedder API does not have a C interface at this point so it's not ready/suitable for a PR, but was an easier way for me to experiment/prove out the concept.

So far I've only tried it out with Hello World, trying out example that use more of the WASI interfaces is a next step.

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