Add sumDouble, sumLong, sumBigDecimal, and sumBigInteger to NumberExpression for forward compatibility with Querydsl 6+

[jparams]

Summary

Add the following typed aggregation helpers to NumberExpression:

• sumDouble()
• sumLong()
• sumBigDecimal()
• sumBigInteger()

Motivation

Querydsl 6+ introduces typed aggregation helpers such as sumDouble() and sumLong().
Adding these methods to Querydsl 5 allows projects to adopt the newer DSL now and makes future upgrades easier.

This provides forward compatibility and reduces code changes required when migrating to newer versions.

Example

qOrder.amount.sumDouble();
qOrder.quantity.sumLong();
qInvoice.total.sumBigDecimal();