Support building an Either from string when it is type aliased and has an assoc object

[nh13]

It would be nice if com.fulcrumgenomics.commons.reflect.ReflectionUtil...buildUnitFromString could work with this:

import com.amazonaws.services.s3.AmazonS3URI
import java.nio.file.Path

type PathOrS3Uri = Either[AmazonS3URI, Path]

object PathOrS3Uri {
  def apply(path: String): S3OrPath = {
    if (path.startsWith("s3://")) Left(new AmazonS3URI(path)) else Right(PathUtil.pathTo(path))
  }
}