Function run_solver 

pub fn run_solver<S, C, P, BuildPhases>(
    solution: S,
    constraints_fn: fn() -> C,
    descriptor: fn() -> SolutionDescriptor,
    entity_count_by_descriptor: fn(&S, usize) -> usize,
    runtime: SolverRuntime<S>,
    default_time_limit_secs: u64,
    is_trivial: fn(&S) -> bool,
    log_scale: fn(&S),
    build_phases: BuildPhases,
) -> S
where
    S: PlanningSolution,
    S::Score: Score + ParseableScore,
    C: ConstraintSet<S, S::Score>,
    P: Phase<S, ScoreDirector<S, C>, ChannelProgressCallback<S>> + Send + Debug,
    BuildPhases: Fn(&SolverConfig) -> P,