- Changing all methods/attributes of the optimizer classes that should be private (which is all that are not part of the public-facing interface to the classes) to be private.

- Adding asymmetric_matrix_inner_products utility function.

- Quad models are returned synced _compute_exact_quad_model, and are not longer synced by _solve_quad_model.

PiperOrigin-RevId: 837080682

Author: james-martens