feat: add from_fn #9
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`from_fn` allows generics and extends the ability of the default `from`
attribute, it also allows for foreign types to be converted, if they
dont implement the correct traits.
```rs
pub struct Example {
#[from_row(from_fn = "json")]
json: HashMap<String, bool>,
}
fn json<T>(wrapper: Json<T>) -> T {
wrapper.0
}
```
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from_fnallows generics and extends the ability of the defaultfromattribute, it also allows for foreign types to be converted, if they dont implement the correct traits.