WIP: Algebraic multigrid with filtering (AMGF) preconditioner for contact linear systems

[thartland]

This PR adds the capability of using AMGF (algebraic multigrid with filtering arXiv preprint)-preconditioned Krylov-subspace linear solvers for the Newton linear solves that arise in outer loop solves of contact problems.

• Obtain list of contact dofs via ContactData::addContactInteraction calls.
• Create a boundary_dof --> subspace transfer operator (mfem::HypreParMatrix) call. Much of this infastructure is in the utilities of continuationsolvers but a version most suitable for usage in smith would be best for less complex code.
• Obtain subspace transfer (displacement dofs --> contact dofs) operator via the list of contact dofs in appropriate place for passing the subspace transfer operator to the preconditioner provided that said linear solver preconditioner is AMGF.
• Resolve usage errors conflating print_level and preconditioner_print_level from linear solver options in the buildPreconditioner method.
• Include test.

For future PR(s)
(1) Alter smith::LinearSolver::Strumpack solver, so that it is robust to the case where there are no rows owned by one or more processors, something that occurs. This will ensure that AMGF preconditioned Krylov-subspace is robust with respect to the number of MPI processes used.
(2) Make AMGF robust to indefiniteness issues stemming from using exact Hessians in Newton solves.
(3) More careful consideration for setting outer/inner tolerances (as well as norms used) for Newton-Krylov.