cats-like implementation of CommutativeGroup for BigDecimal

BigDecimalGroup.scala

class BigDecimalGroup extends CommutativeGroup[BigDecimal] {
  def combine(x: BigDecimal, y: BigDecimal): BigDecimal = x + y
  def empty: BigDecimal = 0
  def inverse(x: BigDecimal): BigDecimal = -x
  override def remove(x: BigDecimal, y: BigDecimal): BigDecimal = x - y
}

implicit val catsKernelStdGroupForBigDecimal: CommutativeGroup[BigDecimal] = new BigDecimalGroup