Added the conversion of quadratic quadrilateral elements in GMSH2OGS

wenqingrequested to merge
wenqing/ogs:GMSH2OGS_quadratic_quad into master

This MR. adds the conversion of quadratic quadrilateral elements in GMSH2OGS. This is a part of !3809 (merged).

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Yes, a ctest is added as
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  1. Any new feature or behavior change was documented?
Edited by wenqing

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