SparkTask data type

[adelbertc]

.. or perhaps another name. It seems to be fairly common (based on my statistically significant sample size of like, 3) to define a Reader-y thing w/ SparkContext. I could imagine something like:

package object bec {
  type SparkTask[A] = Reader[SparkContext, A]
}

// or..

trait SparkTask[A] {
  def run(sc: SparkContext): A

  final def flatMap[B](f: A => SparkTask[B]): SparkTask[B] = ...
  final def map[B](f: A => B): SparkTask[B] = ...
}

object SparkTask {
  def pure[A](a: => A): SparkTask[A] = ...
}

The latter is what I've been using at $JOB. Would perhaps be of interest to add something like this to bec?