Support for `objective_lb_search` in interleaved search

What language and solver does this apply to? CP-SAT

Describe the problem you are trying to solve.

I work on scheduling problems embedded within compilers. Because this is a compiler application, determinism is a hard requirement, which requires me to use interleaved search when I enable multiple workers.

I have found that objective_lb_search is highly effective at proving lower bounds for my makespan minimization problems.

Describe the solution you'd like

Can you please expose objective_lb_search as a supported subsolver within interleaved search?

Describe alternatives you've considered

I have experimented with various supported solvers within interleaved search, including adding various subsolvers I configure on my own. While CP-SAT often finds the optimal solution, it frequently struggles to prove optimality within a reasonable (deterministic) time without objective_lb_search, which is critical for our compilation times.

Additional context

If it's possible at all, I would also appreciate support for remaining solvers as well, though at this point they are not as critical as objective_lb_search for me at this point:

• lb_tree_search
• probing_search
• objective_shaving_search