accumulate min doesn't evaluate correctly with more than 18 digits BigDecimal

[tkobayas]

Rule like this

  when
        accumulate(
            Fact($bd: bd),
            $min: min($bd))

doesn't evaluate correctly if facts have BigDecimal with more than 18 digits

##### insert fact: Fact [bd=2024043020240501120000](doubleValue=2.024043020240501E21)
##### insert fact: Fact [bd=2024043020240501130000](doubleValue=2.024043020240501E21)
##### insert fact: Fact [bd=2024043020240501150000](doubleValue=2.024043020240501E21)
##### insert fact: Fact [bd=2024043020240501170000](doubleValue=2.024043020240501E21)

because NumericMinAccumulateFunction uses doubleValue.

Workaround: Create a custom accumulate function like BigDecimalMinAccumulateFunction

[tkobayas]

Done by
#6186