Add CometColumnarToRowExec based on Spark ColumnarToRowExec

[andygrove]

What is the problem the feature request solves?

We would like to implement a custom version of ColumnarToRowExec to allow for more efficient use of JNI interactions. I would like to break this task down into smaller units of work.

This issue is for creating a new CometColumnarToRowExec which for now is an identical copy of Spark's ColumnarToRowExec and for implementing the planning logic to replace Spark's version with Comet's version.

This then allows is to start iterating on making code changes to improve the interaction between C2R and CometVector.

Describe the potential solution

No response

Additional context

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