[Sorting] Implement combSort on List[Int]

Add implementation of [this method](https://github.com/sentenza/hacktoberfest-scala-algorithms/blob/db28bc1d3dfa6f21c85252041fac271ff0d009db/src/main/scala/io/github/sentenza/hacktoberfest/algos/sort/ImmutableSorting.scala#L74)