feat(reflect-cpp): Switched from glaze -> reflect cpp

A bug was discovered in glaze which prevented valid toml output. We have
switched to toml++ and reflect-cpp. The interface has remained the same
so this should not break any code

build-config/reflect-cpp/include/rfl/internal/element_index.hpp

@@ -0,0 +1,29 @@
+#ifndef RFL_INTERNAL_ELEMENT_INDEX_HPP_
+#define RFL_INTERNAL_ELEMENT_INDEX_HPP_
+
+#include <type_traits>
+
+namespace rfl::internal {
+
+template <int _i, class T>
+consteval int find_element_index() {
+  return -1;
+}
+
+template <int _i, class T, class Head, class... Tail>
+consteval int find_element_index() {
+  if constexpr (std::is_same_v<T, Head>) {
+    return _i;
+  } else {
+    return find_element_index<_i + 1, T, Tail...>();
+  }
+}
+
+template <class T, class... AlternativeTypes>
+consteval int element_index() {
+  return find_element_index<0, T, AlternativeTypes...>();
+}
+
+}  // namespace rfl::internal
+
+#endif