Function run_solver_with_channel 

pub fn run_solver_with_channel<S, C>(
    solution: S,
    finalize_fn: fn(&mut S),
    constraints_fn: fn() -> C,
    get_variable: fn(&S, usize) -> Option<usize>,
    set_variable: fn(&mut S, usize, Option<usize>),
    value_count: fn(&S) -> usize,
    entity_count_fn: fn(&S) -> usize,
    terminate: Option<&AtomicBool>,
    sender: UnboundedSender<(S, S::Score)>,
) -> S
where
    S: PlanningSolution,
    S::Score: Score,
    C: ConstraintSet<S, S::Score>,

Solves a basic variable problem with channel-based solution streaming.

Logs solver progress via tracing. Optionally accepts a termination flag. Solutions are sent through the channel as they improve.