[PL/CT] Add postTimeStep interface

renchao.lurequested to merge
renchao-lu/ogs:AddPostTimeStepInterface into master

The changes of this pull request serve to improve the postTimeStep interface as done for the computeSecondaryVariable interface.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by renchao.lu

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