Feature request: support uuid

For now, I have to write a wrapper like this to deserialize UUID from BLOB:

```rust
#[derive(Debug)]
pub struct UuidRow(pub Uuid);

impl<'de> Deserialize<'de> for UuidRow {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
        let inner = Vec::deserialize(deserializer)?;
        Ok(UuidRow(Uuid::from_slice(&inner).unwrap()))
    }
}
```