When mixed in, allows creation of Slick mapped column types for enumeratum.values.ValueEnum instances

scala> import enumeratum.values._

scala> sealed abstract class TrafficLightByInt(val value: Int) extends IntEnumEntry
scala> object TrafficLightByInt extends IntEnum[TrafficLightByInt] {
    |   case object Red    extends TrafficLightByInt(0)
    |   case object Yellow extends TrafficLightByInt(1)
    |   case object Green  extends TrafficLightByInt(2)
    |   val values = findValues
    | }
scala> trait TrafficLightMappers extends SlickValueEnumColumnSupport {
    |   import profile.api._
    |   implicit val trafficLightColumnType = mappedColumnTypeForValueEnum(TrafficLightByInt)
    | }