Recipe middleware system with WebAssembly

[majori]

The middleware system could extend the recipe logic with hooks, like

• better answer validation
• dynamically adding questions
• adding question options
• pre-execute: make for example network requests before executing the recipe
• post-execute: execute commands after rendering
• render: use wasm binary as external render engine

[majori]

https://github.com/extism/extism could be a nice fit for this

[majori]

We should start with validation hook since it is the most usable