Add Decimation/Interpolation to node class.

* A special tag PerformDecimationInterpolation is required for node be
enable decimation/interpolation.
* Add ports_status to simplify port limits checks.
* Add qa_node.cpp for unit tests of node class.

include/annotated.hpp

@@ -62,6 +62,11 @@ struct Visible {};
  */
 struct BlockingIO {};
 
+/**
+ * @brief Annotates node, indicating to perform decimation/interpolation
+ */
+struct PerformDecimationInterpolation {};
+
 /**
  * @brief Annotates templated node, indicating which port data types are supported.
  */
@@ -133,19 +138,23 @@ struct Annotated {
 
     template<typename U>
     Annotated &
-    operator=(const U &sv) noexcept requires std::is_same_v<T, std::string> && std::is_same_v<U, std::string_view> {
+    operator=(const U &sv) noexcept
+        requires std::is_same_v<T, std::string> && std::is_same_v<U, std::string_view>
+    {
         value = std::string(sv); // Convert from std::string_view to std::string and assign
         return *this;
     }
 
-    operator std::string_view() const noexcept requires std::is_same_v<T, std::string> {
+    operator std::string_view() const noexcept
+        requires std::is_same_v<T, std::string>
+    {
         return std::string_view(value); // Convert from std::string to std::string_view
     }
 
     // meta-information
     static constexpr std::string_view
     description() noexcept {
-        return std::string_view{description_};
+        return std::string_view{ description_ };
     }
 
     static constexpr std::string_view
@@ -189,14 +198,13 @@ struct unwrap_if_wrapped<fair::graph::Annotated<U, str, Args...>> {
  * @brief A type trait class that extracts the underlying type `T` from an `Annotated` instance.
  * If the given type is not an `Annotated`, it returns the type itself.
  */
-    template<typename T>
-    using unwrap_if_wrapped_t = typename unwrap_if_wrapped<T>::type;
+template<typename T>
+using unwrap_if_wrapped_t = typename unwrap_if_wrapped<T>::type;
 
 } // namespace fair::graph
 
 template<typename... Ts>
-struct fair::meta::typelist<fair::graph::SupportedTypes<Ts...>> : fair::meta::typelist<Ts...> {
-};
+struct fair::meta::typelist<fair::graph::SupportedTypes<Ts...>> : fair::meta::typelist<Ts...> {};
 
 #ifdef FMT_FORMAT_H_
 
@@ -222,12 +230,12 @@ struct fmt::formatter<fair::graph::Annotated<T, description, Arguments...>> {
 };
 
 namespace gr {
-    template<typename T, fair::meta::fixed_string description, typename... Arguments>
-    inline std::ostream &
-    operator<<(std::ostream &os, const fair::graph::Annotated<T, description, Arguments...> &v) {
-        // TODO: add switch for printing only brief and/or meta-information
-        return os << fmt::format("{}", v.value);
-    }
+template<typename T, fair::meta::fixed_string description, typename... Arguments>
+inline std::ostream &
+operator<<(std::ostream &os, const fair::graph::Annotated<T, description, Arguments...> &v) {
+    // TODO: add switch for printing only brief and/or meta-information
+    return os << fmt::format("{}", v.value);
+}
 } // namespace gr
 
 #endif // FMT_FORMAT_H_