feat(mean_field): added dimensions, discritization, and start of eos

The full rewrite of mean_field into something maintainable is progressing. dimensions is mostly done, discritization (domain, blocks, and fields) is done, and eos is progressing quickly

src/include/serif/discretization/blocks/base.hpp

@@ -0,0 +1,48 @@
+#pragma once
+
+namespace serif::discretization::blocks {
+    inline constexpr int DYNAMIC_BLOCK_SIZE = -1;
+
+    struct block {};
+
+    struct residual_block_base : block {
+        static constexpr int static_block_size = DYNAMIC_BLOCK_SIZE;
+    };
+
+    struct value_block_base : block {
+        static constexpr int static_block_size = DYNAMIC_BLOCK_SIZE;
+    };
+
+    template <typename GeneratedValue>
+    struct generated_value_block final : value_block_base {
+        using GeneratedType = GeneratedValue;
+        static constexpr int static_block_size = static_cast<int>(GeneratedValue::scalarArity);
+    };
+
+    template <typename GeneratedResidual>
+    struct generated_residual_block final : residual_block_base {
+        using GeneratedType = GeneratedResidual;
+        static constexpr int static_block_size = static_cast<int>(GeneratedResidual::scalarArity);
+    };
+
+    template <int index_value>
+    struct residual_block final : residual_block_base {
+        static constexpr int index = index_value;
+
+        // ReSharper disable once CppNonExplicitConversionOperator
+        constexpr operator int() const noexcept {
+            return index;
+        }
+    };
+
+    template <int index_value>
+    struct value_block final : value_block_base {
+        static constexpr int index = index_value;
+
+        // ReSharper disable once CppNonExplicitConversionOperator
+        constexpr operator int() const noexcept {
+            return index;
+        }
+    };
+
+}