MFEM4.6 support

[sshiraiwa]

This is note for PyMFEM 4.6

• [x] Include new/missing header files (sidredatacollection.hpp, staticcond.hpp) (https://github.com/mfem/PyMFEM/pull/198)
• [x] Missing doftrans.i in fe_base.i (https://github.com/mfem/PyMFEM/pull/198)
• [x] https://github.com/mfem/PyMFEM/pull/202
• [x] add examples (34, 34p, 35p, 36, 36p, 37, 37p, 38) https://github.com/mfem/PyMFEM/pull/203
• [x] address https://github.com/mfem/PyMFEM/issues/193
• [x] https://github.com/mfem/PyMFEM/pull/204
• [x] https://github.com/mfem/PyMFEM/pull/195

Carried over from 4.5.2

• [ ] Include test with Python3.11
• [ ] PETSc https://github.com/mfem/PyMFEM/pull/162