AK: Add Array::from_repeated_value()

Author: https://github.com/timschumi
Commit: https://github.com/SerenityOS/serenity/commit/e2d4952f0f
Pull-request: https://github.com/SerenityOS/serenity/pull/22202
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/LucasChollet

AK/Array.h

@@ -37,6 +37,13 @@ struct Array {
         return array;
     }
 
+    static constexpr Array from_repeated_value(T const& value)
+    {
+        Array array;
+        array.fill(value);
+        return array;
+    }
+
     [[nodiscard]] constexpr T const* data() const { return __data; }
     [[nodiscard]] constexpr T* data() { return __data; }