refactor: upgrade to uniffi v0.29

[Leeeon233]

Here is an attempt using uniffi-rs v0.29, in which they support Allow UDL to define Enums with objects so that we can

[Enum]
interface Container{
    List(LoroList container);
    Map(LoroMap container);
    Text(LoroText container);
    Tree(LoroTree container);
    MovableList(LoroMovableList container);
    Counter(LoroCounter container);
    Unknown(LoroUnknown container);
};

[Enum]
interface ValueOrContainer{
    Value(LoroValue value);
    Container(Container container);
};

However, the definition of remote type is strengthened at the same time. In the current architecture, all types in loro-ffi are remote types. uniffi-rs do not yet support remote definitions of traits