AK: Add deduction guides to Tuple

Author: https://github.com/alimpfard
Commit: b6e5c76427
Pull-request: https://github.com/SerenityOS/serenity/pull/7255
Reviewed-by: https://github.com/linusg

AK/Tuple.h

@@ -213,6 +213,9 @@ private:
     }
 };
 
+template<class... Args>
+Tuple(Args... args) -> Tuple<Args...>;
+
 }
 
 using AK::Tuple;