Added more detail in obtaining first result

src/Concept/Database/ResultSet.php

@@ -9,5 +9,6 @@ interface ResultSet
     public function execute(array $values): ResultSet;
     public function getAsArray(): array;
     public function getAsObject(): array;
-    public function getFirst(): mixed;
+    public function getFirstAsArray(): array;
+    public function getFirstAsObject(): object;
 }