Add a static Error method in Result<T> and Result classes that accepts an Error object

[jocifer93]

It would be helpful to have an Error class similar to the existing ValidationError class, which can be used to encapsulate error details. Something like this:

public class Error
{
    public string Message { get; set; }
    public string Code { get; set; }
}

Additionally, it would be great to add a static Error method in both the Result<T> and Result classes that accepts an Error object.

[savornicesei]

Actually it would simplify things if the 2 lists of errors will be merged into a single list of type

Error(ErrorType type, string code, int severity, string description)
public partial enum ErrorType{
 Validation,
 Execution,
 Custom
}