Add support for BIG_DECIMAL addition in merge rollup tasks

[raghavagrawal]

In the current state minion merge rollup tasks do not support addition of BIG_DECIMAL values. We can support the same.

pinot/pinot-core/src/main/java/org/apache/pinot/core/segment/processing/aggregator/SumValueAggregator.java

Line 28 in afb75d2

public class SumValueAggregator implements ValueAggregator {

[Jackie-Jiang]

We can add a SumPrecisionValueAggregator to be consistent with query time aggregate. Do you want to help contribute this?

[raghavagrawal]

Yes, I can contribute this.

[github-actions]

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