SketchMap is not commutative

[Peilin-Yang]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Add the following new test to the unit test algebird/algebird-test/src/test/scala/com/twitter/algebird/SketchMapTest.scala after line 57

    "plus should work commutatively" in {
      implicit val m = Monoid.longMonoid
      val valueTableLeft =
        DenseMatrix(
          PARAMS.width,
          PARAMS.depth,
          rowsByColumns = IndexedSeq(10L) ++ (1 until PARAMS.width * PARAMS.depth).map(_ => 0L)
        )
      val testLeft = SketchMap[Int, Long](
        valuesTable = valueTableLeft,
        heavyHitterKeys = List(1),
        totalValue = 10
      )

      val valueTableRight = SparseColumnMatrix(rowsByColumns =
        IndexedSeq(
          SparseVector(
            map = Map(1 -> 1L),
            sparseValue = 1L,
            length = PARAMS.width * PARAMS.depth
          )
        )
      )
      val testRight = SketchMap[Int, Long](
        valuesTable = valueTableRight,
        heavyHitterKeys = List(1),
        totalValue = 1
      )

      assert(MONOID.plus(testLeft, testRight) == MONOID.plus(testRight, testLeft))
    }

3. Run the test and it would fail

Expected behavior

The test is expected to pass

Screenshots
N/A

Environment
N/A

Additional context
This is mainly because the algebird/algebird-core/src/main/scala/com/twitter/algebird/matrix/AdaptiveMatrix.scala doesn't handle the (SparseColumnMatrix, DenseMatrix) input (in that order) correctly.