Add an example for Node.js

[BjrInt]

This example is based off the FastAPI example with some differences:

• The state example is using an ephemeral keypair (used to send message) instead of a counter
• The "post a message on Aleph" and "retrieve http post data" are merged into a single example
• There is no "cache"

[hoh]

The goal of the state example is to mute data in a file on disk inside a mutable volume. Why change its logic ?

[hoh]

Posting a message on Aleph and handling HTTP Post requests are two different things, we should keep them separate in order to test and diagnose better.

[hoh]

How should we build and package this application in the CI ?

[moshemalawach]

Not reviewed at all, this was a spam comment by a spam account @NostalgicGareth. He goes and spam a lot of projects like this.

[MHHukiewitz]

Can we get confirmation that this still works as intended?

We talked about how we should support more languages/frameworks in the VMs and also to improve examples/docs for deploying these. Merging this PR should help with that.