[Warn] - Prefer `nameof(...)` over strings

**Example of code diagnostic:**
```csharp
// Good example
[ForMember<User, UserDto>(nameof(UserDto.TimeOfBirth))]
public static TimeOnly GetTimeOfBirth(User source) => new (source.DateOfBirth.UtcDateTime.TimeOfDay.Ticks);

// Bad example
[ForMember<User, UserDto>("TimeOfBirth")]
public static TimeOnly GetTimeOfBirth(User source) => new (source.DateOfBirth.UtcDateTime.TimeOfDay.Ticks);
```