Algebraic multigrid with filtering contact (AMGFContact) 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.
• Test.

For future investigation/potential PR(s)
(1) Make AMGFContact robust to indefiniteness issues stemming from using exact Hessians in Newton solves.
(2) More careful consideration for setting outer/inner tolerances (as well as norms used) for Newton-Krylov.

Note -- AMGFContact preconditioned Krylov-subspace methods will fails unless the problem is a contact problem. The failure is indicated by mfem generated error messages indicating that the subspace transfer operator has not been set.