Allowing dispensers to dispense properly in unloaded chunks (Java)

In order to have entities launched from dispensers process properly, the chunks around the dispensers need to be loaded to entity processing. To achieve this, make dispensers load the chunk they are in at level 30 for 15 seconds every time they are activated. That way, the dispensers will dispense properly both within chunks and across chunk borders without bulky portal chunk loaders. This is useful for remotely activating dispensers when other forms of chunk loading are impossible, such as in a gigantic Rube Goldberg machine that extends across multiple chunks, or in other large contraptions involving dispensers.