Migration to the procedural macros system of uniffi-rs

[thunderbiscuit]

I'm opening this issue to keep track of documentation, references, and discussions around the migration to the new uniffi-rs system.

1. Documentation page on using proc-macros: here
2. Issue on readiness of migration and further documentation: here
3. PR for the 0.23.0 migration: Bump uniffi-rs dependency to 0.23.0 #299

[aki-mizu]

It seems rust-nostr already successfully migrated their ffi part to proc-macro
rust-nostr/nostr#204

[reez]

Thunder how interested are you in doing this at the current moment, just wondering what you're current thoughts would be for this

[thunderbiscuit]

Looking into it now. I'm not sure if we'd be able to migrate everything or if some things would stay in the UDL and some would be proc macros.

But the one prerequisite to this is that we use the --library flag to create the library, which is recommended anyway and is a good move forward no matter what if we can do it, so I think we can start with that and see where it leads us.

[reez]

awesome, thanks for those thoughts, and --library makes sense to start like you're saying