Add dynamic error message within builder

[mr5z]

Implement it something like below:

validationService.For(....)
    .AddRule(e => e.FirstName, new StringRequiredRule(), new new RangeLengthRule(10, 15))
    .OverrideErrorMessage((propertyName, rule) => {
        if (propertyName == nameof(FirstName))
        {
            return $"First Name must be within ({FirstName.Length}/15)";
        }
    });