MFEM 4.8 support

[sshiraiwa]

This PR does

• changed requirement swig >= 4.3
• fixed bilinearform.i issue due to change in BilinearForm::Print
• fixed trasfer.i not knowing mfem::Device (due to the new use of MemoryType in hpp)
• fixed eltrans.i issue by ignoring kernel_dispatch macro
• addressed fe_base.i by failing C++ STL template expansion. This is because poly1d is exported from header.
• changed default MFEM build to v4.8

This PR also include (https://github.com/mfem/PyMFEM/pull/254), which does

1. address recent addition of kernel_dispatch.hpp in MFEM C++.

• kernel_dispatch.hpp doesn't need to be exposed to Python. But, we need MFEM_REGISTER_KERNELS macro to be defined somehow. In this PR, MFEM_REGISTER_KERNELS is replaced to be empty macro. So that SWIG does not see the lines containing this macro.

2. Add CoefficentArray, VectorCoefficientArray, and MatrixCoefficientArray (represent Array<* Coefficient> and so on)

• Changed Array constructor behavior when list of SWIG-wrapped MFEM objects is passed. SWIG objects passed as an item in list/tuple looses owner ship to underlying C++ MFEM object. Internally, we create a new Array (depending on the length of container) and set each Array element one by one (after setting thisown to False).

3. Renamed other Array< * MFEM object>.

• They are used to be named like VectorPtrArray. We simplify it as VectorArray.

4. SparseMatrixArray2D, DenseMatrixArray2D, HypreParMatrixArray2D are added

• HypreParMatrixArray2D can be used with mfem.HypreParMatrixFromBlocks
• DenseMatrixArray2D appears in BlockNonlinearFormIntegrator
• SparseMatrixArray2D is used wtih MixedBilinearForm::GetBlocks

[sshiraiwa]

To Do in https://github.com/mfem/PyMFEM/issues/268