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/extract_discriminators.hpp

@@ -0,0 +1,25 @@
+#ifndef RFL_INTERNAL_EXTRACTDISTRIMINATORS_HPP_
+#define RFL_INTERNAL_EXTRACTDISTRIMINATORS_HPP_
+
+#include <type_traits>
+
+#include "../TaggedUnion.hpp"
+#include "../define_literal.hpp"
+#include "../field_type.hpp"
+
+namespace rfl {
+namespace internal {
+
+template <class TaggedUnionType>
+struct extract_discriminators;
+
+template <StringLiteral _discriminator, class... NamedTupleType>
+struct extract_discriminators<TaggedUnion<_discriminator, NamedTupleType...>> {
+  using type = define_literal_t<
+      std::remove_cvref_t<field_type_t<_discriminator, NamedTupleType>>...>;
+};
+
+}  // namespace internal
+}  // namespace rfl
+
+#endif