Merge branch 'release'

Increase patchlevel to 3.16.3

petsc4py plex: destroy dmDet after enforcing SPD

Merge branch 'stefanozampini/petsc4py' into 'main'

Some work on petsc4py

See merge request petsc/petsc!4644

petsc4py: Add backward compatibility for renamed PtAP

MatProduct: move API from internal petsc4py usage to PETSc headers.

petsc4py: allow snes.solve to use the internal solution vector

petsc4py: add option to disable memory leak check

this is useful when debugging failures of the python interpreter on testing code

MATIS: fix what NULL means for l2gmap

conceptually, a NULL l2map is a full local to global map
petsc4py: support for MatCreateIS and add MATIS tests

petsc4py: add support for Mat{Set|Get}VecType

MATPYTHON: fallback to submatrix virtual creation if createSubMatrix is not supported

petsc4py: test Mat shift and scale methods

petsc4py: expose PCGetUseAmat

petsc4py: expose PCMatApply

added tests

petsc4py: Use PyList API in traceback error handler

MATPYTHON: remove dead code

libpetsc4py: fix missing space after commas

MATPYTHON: implement MatHasOperation_Python

add tests

MatConvert_Basic: use matvecs if getrow is not implemented

Allow MatEqual to run the matvecs comparison if the implementation is not found
Add test for MATPYTHON

petsc4py: support other device types with dlpack

petsc4py: Add HIP wrappers

petsc4py plex: metricSetFromOptions

Add two functions to Mat:
1. createHermitianTranspose
2. createNormalHermitian

petsc4py: add support to run selected tests

For example, we can only run one unit test
python test/runtests.py -k test_mat_py.TestIdentity.testMatMat

MATPYTHON: add support for matrix matrix operations