add ability to choose time array for pio reader

Boonthanome Nouanesengsyrequested to merge
boonth/vtk:pio_reader_timearray into master

pio files can now choose to use cycle number or simulation time as their time array

Paraview merge request paraview/paraview!4176 (merged) depends on this

@patchett2002 @cory.quammen

Backport: paraview/release

Edited by Boonthanome Nouanesengsy

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