Use fake-rs to generate random value on struct creation

[kimond]

The lib https://github.com/cksac/fake-rs would be interesting to provide fake data through attributes.
example:

#[derive(
struct MyModel {
    #[facto(fake="first_name")]
    name: String,
    age: u8,
    height: f32,
}

In the example above, the attribute fake="first_name" would use the fake-rs fake name generation.