wip: experiment around a hybrid (nacre) shell

[o0Ignition0o]

Super early draft, a lot of things to figure out together and document.

Coauthored by @regexident.

I hope I can draft a rough explainer of the various components soon ™️

TLDR:

• One can register a callback crux must call to generate effects out of band (not within the request/response model)
• The effect macro generates a NacreEffect implementation, depending on the sort of effect (notify_shell, request_from_shell, stream_from_shell)
• Nacre is some sort of middleware that plugs between the core and the bridge, that has the ability to drive streams to completion.
• NacreBridge deals with forwarding the effects via the callback
• Probably more but i forgot, I ll try to draw a schema sometimes.

Next things I need to do:

• turn the UDL based definition to a macro to please uniffi with the callback / trait registration
• rebump dependencies
• see what ideas are good and what ideas aren't
• ???
• profit

[o0Ignition0o]

hope i can rebump these very soon