Make attributes usable on record parameters

Why write lot code...

```cs
public sealed partial record Command
(
    [property: MinLength(20)] string Name,
    [property: MaxLength(250)] string Description,
) : IValidationTarget<Command>;
```

... when few code do trick?

```cs
public sealed partial record Command
(
    [MinLength(20)] string Name,
    [MaxLength(250)] string Description,
) : IValidationTarget<Command>;
```