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/num_fields.hpp

@@ -0,0 +1,14 @@
+#ifndef RFL_NUM_FIELDS_HPP_
+#define RFL_NUM_FIELDS_HPP_
+
+#include "internal/num_fields.hpp"
+
+namespace rfl {
+
+/// Returns the number of fields fields.
+template <class T>
+constexpr std::size_t num_fields = internal::num_fields<T>;
+
+}  // namespace rfl
+
+#endif