feat(GridFire): added weak electron screening

src/network/include/gridfire/screening/screening_abstract.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "gridfire/reaction/reaction.h"
+
+#include "fourdst/composition/atomicSpecies.h"
+
+#include "cppad/cppad.hpp"
+
+#include <vector>
+
+namespace gridfire::screening {
+    class ScreeningModel {
+    public:
+        using ADDouble = CppAD::AD<double>;
+        virtual ~ScreeningModel() = default;
+
+        virtual std::vector<double> calculateScreeningFactors(
+            const reaction::LogicalReactionSet& reactions,
+            const std::vector<fourdst::atomic::Species>& species,
+            const std::vector<double>& Y,
+            const double T9,
+            const double rho
+            ) const = 0;
+
+        virtual std::vector<ADDouble> calculateScreeningFactors(
+            const reaction::LogicalReactionSet& reactions,
+            const std::vector<fourdst::atomic::Species>& species,
+            const std::vector<ADDouble>& Y,
+            const ADDouble T9,
+            const ADDouble rho
+            ) const = 0;
+    };
+}