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/variant/is_convertible_to.hpp

@@ -0,0 +1,17 @@
+#ifndef RFL_INTERNAL_VARIANT_IS_CONVERTIBLE_TO_HPP_
+#define RFL_INTERNAL_VARIANT_IS_CONVERTIBLE_TO_HPP_
+
+#include <type_traits>
+
+#include "../element_index.hpp"
+
+namespace rfl::internal::variant {
+
+template <class T, class... AlternativeTypes>
+static constexpr bool is_convertible_to() {
+  return std::disjunction_v<std::is_convertible<T, AlternativeTypes>...>;
+}
+
+}  // namespace rfl::internal::variant
+
+#endif