[Feature Request]: Drools Accumulator - Inject vs. modify row

### What would you like to happen?
Migration: https://issues.apache.org/jira/browse/HOP-4096

Hello, I placed a comment in commit for HOP
https://github.com/apache/hop/commit/2e757440c4654b58299324229a4c6b51d1e3ca38#diff-eac62f95891a0ff873fef552a12d204d83fb852db04850c10b57ebfb13c84e46R158

I Think that collecting resultList is not implemented with support of all DRL functions: 
https://docs.drools.org/7.68.0.Final/drools-docs/html_single/index.html#drl-rule-units-con_drl-rules

Drools for hop does not support modify existing row from variable memory
Only rows which are injected to WorkMemory directly with inject(row) are available in output of drools accumulator.
But it is not valid behaviour, there are use cases when accumulator modifies existing ones.

the problem could be workarounded if 
inject(new Row($originalRow))  would work
however there is no Constructor in Row Class (Rule.java)

we have version 2.0. HOP

### Issue Priority

Priority: 3

### Issue Component

Component: Transforms

Start with the referenced HOP commit and the Drools rule-unit documentation, then inspect Rule.java and the accumulator handling around resultList. Determine how modified rows from variable memory are currently treated; done means rows modified by the accumulator are included in its output, including the described Row workaround if appropriate.

Written by the indexing model from the issue text.