Enable changing dim and pop size in CMA-ES

optimization/optimizers/cma_es/cma_es.h

@@ -25,6 +25,11 @@ public:
     uint32_t n_evaluations() const { return n_evaluations_; }
     uint32_t n_iterations() const { return n_iterations_; }
 
+    uint32_t dim() const { return dim_; }
+    uint32_t& dim() { return dim_; }
+    uint32_t pop_size() const { return pop_size_; }
+    uint32_t& pop_size() { return pop_size_; }
+
     template <typename Objective>
     VectorXs optimize(
         Objective& objective,