AK: Add the Fundamental concept

Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/604309327e
Pull-request: https://github.com/SerenityOS/serenity/pull/12732
Reviewed-by: https://github.com/linusg

AK/Concepts.h

@@ -18,6 +18,9 @@ concept Integral = IsIntegral<T>;
 template<typename T>
 concept FloatingPoint = IsFloatingPoint<T>;
 
+template<typename T>
+concept Fundamental = IsFundamental<T>;
+
 template<typename T>
 concept Arithmetic = IsArithmetic<T>;
 
@@ -109,6 +112,7 @@ using AK::Concepts::Arithmetic;
 using AK::Concepts::ArrayLike;
 using AK::Concepts::Enum;
 using AK::Concepts::FloatingPoint;
+using AK::Concepts::Fundamental;
 using AK::Concepts::Integral;
 using AK::Concepts::IterableContainer;
 using AK::Concepts::IteratorFunction;