Implement `wasm` plugin system

[DougAnderson444]

Libp2peasy Plugins

Raising this issue as @p-shahi mentioned at this week's libp2p community call with @dhuseby that @marcopolo had mentioned the idea of building portable libp2p modules (kad-dht) implemented in any language and compiled to Wasm.

Plugins enable us to have a single "base layer" libp2p application such as libp2peasy (or whatever) and use other peoples' plugins with your data in a sandboxed way.

I'm working toward this direction, using https://extism.org/ and have some basic working versions of plugins, they just need to be written and integrated into libp2peasy.

See

• https://github.com/DougAnderson444/extism-browser
• https://github.com/DougAnderson444/extism-demo

I see Plugins as basically having 2 handles:

• [ ] - Some sort of on_message handler to process pubsub messages
• [ ] - A host function for publish can be passed in to respond to any message

I see the plugin basically handling a message, encoding/processing/responding in the appropriate way, then possibly publishing if appropriate. Very early thoughts at this point.

Top on my list are the following plugins:

• [ ] - IPNS
• [ ] - Name name system support
• [ ] - Video broadcast over gossipsub
• [ ] - Versatile chat plugin similar to Nostr**

** I'm going to call it Postr, because:

• P comes after N in the alphabet
• It is similar to Poster, as in posting messages
• It is similar to Imposter, as in a Nostr Imposter
• It will use gossipsub instead of the Nostr floodsub
• It will enable all the libp2peasy transports, so you can run a Postr node at home
• It will be plugin compatible, so if you want to customize it, you just create a new plugin instead of having to build a who new app from the ground up

[DougAnderson444]

Plugins are essentially precompiled codecs which you can load at runtime, can be written by someone else, and can safely handle your data

[DougAnderson444]

codec Plugins could operate on:

• pubsub: broadcast Do something internally to the app when a topic gets a message
• request-response: p2p request and respond with something for a specific request