Make creation of a Scalar decimal value simpler

[razajafri]

So the original code that this was commented on is

        if (DecimalType.is32BitDecimalType(dt)) {
          withResource(Scalar.fromDecimal(-scale, 0)) { scalar =>
            scalar.sub(input.getBase)
          }
        } else {
          withResource(Scalar.fromDecimal(-scale, 0L)) { scalar =>
            scalar.sub(input.getBase)
          }
        }

Is there a way to make an API where we could combine the two if blocks?
Originally posted by @revans2 in #1717 (comment)

[kuhushukla]

We can add a generic fromDecimal is templated or uses Object and we pass the precision or some metadata bit to do this logic through the API.

[revans2]

The code in question is gone now. We already have a GpuScalar.from that does this and has replaced most calls. I think this is good enough.

[kuhushukla]

Thank u Bobby. Maybe we should use that https://github.com/NVIDIA/spark-rapids/blob/branch-22.02/sql-plugin/src/main/scala/org/apache/spark/sql/rapids/arithmetic.scala#L79