Support `SyncReturn<Struct>, SyncReturn<Enum>`

[rogurotus]

SyncReturn has been recently redesigned (thanks @ngasull for the great implementation) judging by the implementation, it became possible to use SyncReturn(Struct) SyncReturn(Enum), but for some reason I do not understand, this is restricted.

The restriction is imposed here. frb_rust/src/lib.rs

/// Use this struct in return type of your function, in order to tell the code generator
/// the function should return synchronously. Otherwise, it is by default asynchronously.
pub struct SyncReturn<T: IntoDart>(pub T);

although frb generates IntoDart and if you do pub struct SyncReturn<T>(pub T); in SyncReturn it will be possible to use structure

[fzyzcjy]

IMHO it should be possible to use struct/enum in sync return as well. What error does it generate when doing so?

[rogurotus]

In general, I understood this works when the implementation is already there, but if you are generating for the first time then the error is caught before the code is generated

error like this

pub struct SyncReturn<T: IntoDart>(pub T);
     |                          ^^^^^^^^ required by this bound in `flutter_rust_bridge::SyncReturn`

In theory, we can remove the restriction from struct SyncReturn since there is already an IntoDart restriction in the generated code

[fzyzcjy]

Feel free to PR! (and let's see how CI says - if CI is happy then IMHO this should be ok)

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