MFEM4.6 support

[sshiraiwa]

This is note for PyMFEM 4.6

• Include new/missing header files (sidredatacollection.hpp, staticcond.hpp) (minumum changes to build PyMFEM with MFEM4.6 #198)
• Missing doftrans.i in fe_base.i (minumum changes to build PyMFEM with MFEM4.6 #198)
• Get serial grid function fix #202
• add examples (34, 34p, 35p, 36, 36p, 37, 37p, 38) New translated Python examples #203
• address FindPointsGSLIB::GetCode() does not return mfem::Array<unsigned int> #193
• Array<T> clean up #204
• Added field_diff.py version of field-diff.cpp miniapp example #195

Carried over from 4.5.2

• Include test with Python3.11
• PETSc PETSc support dev #162

[sshiraiwa]

Closing this. Moving on to #223