Add Rosenbrock integrator

[BenWibking]

Summary

This adds a new integration/Rosenbrock integrator implementation with runtime-selectable Rosenbrock tableaus and timestep controllers.

Rosenbrock methods:

• Rosenbrock-Euler (equivalent to YASS; Khoklov, unpublished)
• ROS2 (https://scixplorer.org/abs/1999SJSC...20.1456V/abstract)
• ROS2S (https://doi.org/10.1016/j.apnum.2012.08.001.)
• Sandu methods A-D (https://www.mtu.edu/cs/research/papers/pdfs/favor-report.pdf)

Timestep controllers:

• H211b error-history timestep control (https://doi.org/10.1145/641876.641877.)
• YASS concentration-change timestep control

The integrator supports both Strang and SDC setup paths through separate actual_integrator headers, uses the existing RHS/Jacobian/linear-solve interfaces, and exposes runtime parameters for tableau selection, rejection behavior, and controller tuning.

[BenWibking]

@zingale Here's the draft PR. This does not have all the performance optimizations that I tried.

[BenWibking]

This version wins by a few percent on CPU [Mac laptop] over VODE for primordial_chem when building both with Clang (which is much faster than gcc on CPU for these problems).

The performance delta is significantly larger on a Hopper GPU (in favor of Rosenbrock).

[zingale]

this gets an FPE if I build and run test_react as:

make INTEGRATOR_DIR=ROS2S DEBUG=TRUE
./main3d.gnu.DEBUG.ex inputs_aprox13  amrex.fpe_trap_invalid=1

[zingale]

it seems to be that it is generating really negative mass fractions and that's causing the failure, so we probably need more step rejection logic.

[BenWibking]

The docs fail due to this broken link (or Zenodo not accepting connections from the CI?)

(          citing: line    2) broken    https://doi.org/10.5281/zenodo.2620544 - 403 Client Error: Forbidden for url: https://zenodo.org/doi/10.5281/zenodo.2620544