Drowsiness refactor (#62104)

Creates two procs in /mob/status_procs for handling drowsiness changes (with check for negative values), and refactors all code to use these procs instead of assigning values to the mob's drowsiness themselves.

code/modules/mining/fulton.dm

@@ -113,7 +113,7 @@ GLOBAL_LIST_EMPTY(total_extraction_beacons)
 			if(ishuman(A))
 				var/mob/living/carbon/human/L = A
 				L.SetUnconscious(0)
-				L.drowsyness = 0
+				L.set_drowsyness(0)
 				L.SetSleeping(0)
 			sleep(30)
 			var/list/flooring_near_beacon = list()