feat(policy network stack): Policies can now return the network stack

Policies can now return the network stack which allows the caller more
control over settings and running a solver against various levels of the
stack. Further, policies can return the partition function used as well
as a vector of enums which describe the structure of the network stack.

src/include/gridfire/policy/policy_abstract.h

@@ -24,10 +24,13 @@
 #include "fourdst/atomic/atomicSpecies.h"
 #include "gridfire/reaction/reaction.h"
 #include "gridfire/engine/engine_abstract.h"
+#include "gridfire/partition/partition.h"
 
 #include <string>
 #include <set>
 
+#include "gridfire/engine/types/engine_types.h"
+
 
 namespace gridfire::policy {
     /**
@@ -157,6 +160,12 @@ namespace gridfire::policy {
          * @endcode
          */
         [[nodiscard]] virtual NetworkPolicyStatus getStatus() const = 0;
+
+        [[nodiscard]] virtual const std::vector<std::unique_ptr<DynamicEngine>> &get_engine_stack() const = 0;
+
+        [[nodiscard]] virtual std::vector<EngineTypes> get_engine_types_stack() const = 0;
+
+        [[nodiscard]] virtual const std::unique_ptr<partition::PartitionFunction>& get_partition_function() const = 0;
     };
 
     /**

src/include/gridfire/policy/stellar_policy.h

@@ -142,6 +142,12 @@ namespace gridfire::policy {
          * @return NetworkPolicyStatus The construction and verification status.
          */
         [[nodiscard]] NetworkPolicyStatus getStatus() const override;
+
+        [[nodiscard]] const std::vector<std::unique_ptr<DynamicEngine>> &get_engine_stack() const override;
+
+        [[nodiscard]] std::vector<EngineTypes> get_engine_types_stack() const override;
+        [[nodiscard]] const std::unique_ptr<partition::PartitionFunction>& get_partition_function() const override;
+
     private:
         std::set<fourdst::atomic::Species> m_seed_species;
 
@@ -155,6 +161,8 @@ namespace gridfire::policy {
         static std::unique_ptr<partition::PartitionFunction> build_partition_function();
         [[nodiscard]] NetworkPolicyStatus check_status() const;
 
+    public:
+
     };