NonNilUuid support

Uuid crate in 1.12 release introduced non-zero variant `NonNilUuid`, which should be supported by `rkyv = { features = ["uuid-1"] }`.


```rust
#[derive(rkyv::Archive, rkyv::Deserialize, rkyv::Serialize)]
pub struct SomeData{
    pub uuid: NonNilUuid,
    pub optional_uuid: Option<NonNilUuid>,
}
```