Expand FailIf

[virzak]

I am using the following to fill functionality that's missing for my project. What are your thoughts on this and will you take a PR with similar functionality?

static class MyResult
{
    public static Result FailIf(bool isFailure, IEnumerable<IError> errors)
        => isFailure ? Result.Fail(errors) : Result.Ok();
    
    public static Result FailIfNotEmpty(IEnumerable<IError> errors)
        => errors.Any() ? Result.Fail(errors) : Result.Ok();

    public static Result FailIfNotEmpty<T>(IEnumerable<T> errors, Func<T, IError> func)
        => errors.Any() ? Result.Fail(errors.Select(error => func(error))) : Result.Ok();
}