Parse `OwnedLazyValue` into a custom struct

**Is your feature request related to a problem? Please describe.**

For `Value`, we can use `sonic_rs::from_value` to parse it into a custom struct.
For `LazyValue`, we can use `LazyValue::as_raw_str` to access raw str, than use `sonic_rs::from_str` to parse it into a custom struct.
But for `OwnedLazyValue`, I don't know how to parse it into a custom struct. In version 0.3, I can also use `as_raw_str` to process it, but the current version does not have this method.

**Describe the solution you'd like**
maybe like this
```rust
let foo: Foo = Foo::deserialize(owned_lazy_value)?;
```