Add advanced checkpoint/restart capabilities to Hiop

[tepperly]

Many HPC applications need to implement a checkpoint/restart capability to address either:

• maximum job time allocations (e.g., no jobs can run for more than 24 hours)
• fault tolerance (e.g., individual parts of a supercomputer can fail leading to premature job failure)

To address these concerns, typical HPC applications periodically write their internal state to hard drive (checkpointing) and then have the ability to restart and resume progress from the last checkpoint file.

Hiop has some ability to warm start through the get_starting_point() or get_warm_start(). However, it would be better if Hiop could save more of its internal state to do a better restart.

The ::axom::sidre package provides a flexible checkpoint/restart API and implementation. Multiple LLNL packages use ::axom::sidre. The repository is here. It's buildable with Spack.