vtkAggregateDataSetFilter: Add TargetProcess

Spiros Tsalikisrequested to merge
spiros.tsalikis/vtk:add-vtkAggregateDataSetFilter-target-process into master

The vtkAggregateDataSetFilter has a new TargetProcess property, which has the following options:

  1. vtkAggregateDataSetFilter::TargetProcessType::ROOT_PROCESS: the data from all processes are aggregated to the root process of a (sub)controller. This is useful to ensure consistent aggregation across data that their number of points change over time.
  2. vtkAggregateDataSetFilter::TargetProcessType::PROCESS_WITH_MOST_POINTS (default): the data from all processes are aggregated to the process that has the most points. This is useful to minimize the amount of data that needs to be sent across the network, but it can lead to inconsistent aggregation across time if the process with the most points changes over time.

This MR resolves #19962 (closed).

Edited by Spiros Tsalikis

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