clean up namespaces

include/sp/common/Templates.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <cstdint>
+
+namespace sp {
+
+/// @brief Concat multiple tuples in one big tuple
+/// @tparam ...input_t Multiple std::tuple types to concat
+template <typename... input_t>
+using tuple_cat_t = decltype(std::tuple_cat(std::declval<input_t>()...));
+
+}  // namespace sp