Enable various types of interaction to return items to the player, without needing to have a bunch of boilerplate creative mode and held item checks

it became glaringly obvious that this was needed because of #4827 and #4868.

this is further needed with the addition of cauldrons.

src/block/Sapling.php

@@ -74,7 +74,7 @@ class Sapling extends Flowable{
 		return false;
 	}
 
-	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
+	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null, array &$returnedItems = []) : bool{
 		if($item instanceof Fertilizer && $this->grow($player)){
 			$item->pop();