chore: update to uniffi 0.30

[istankovic]

This PR is heavily based on #322, with some differences:

• it tries to do the minimum work necessary to move to uniffi 0.30
• lints are unit tests have been fixed

Unfortunately, JSI and WASM tests still fail and I do not know how to fix them.
In particular, the WASM async callbacks test is failing with

error[E0599]: no method named `into_js` found for struct `NonNull<T>` in the current scope
    --> src/async_callbacks_module.rs:1374:61
     |
1374 | ...                   uniffi_out_dropped_callback.into_js(),
     |                                                   ^^^^^^^
     |
help: there is a method `into` with a similar name
     |
1374 -                                 uniffi_out_dropped_callback.into_js(),
1374 +                                 uniffi_out_dropped_callback.into(),
     |

[jhugman]

Hey @istankovic Thanks for diving in!

Let me know if there's anything I can do to help!