Persistence code refactoring (#22044)

# Summary

This PR refactores code and structure of the current persistence
subsystem, in preparation for Persistency: Circles, Squares and
Triangles.

This should not contain any user facing changes.

~~This PR is based of branch #21925 and **needs** to be merged in order.
The files changed display will be meaningless until then.~~ *Done.*

## Changes

- Split subsystem in partial files.
- Refactored proc names, added "persistentObject" format for current
code.
- Renamed SQL table.
- Refactored logging and call hiearachy.
- Fix CI labeler adding DB label on non-SQL files.

code/game/objects/items.dm

@@ -507,7 +507,7 @@
 		return
 
 	if(in_storage) // Items getting moved into storages (lunchboxes, backpacks) triggers the dropped handler and requires no persistency as a result
-		SSpersistence.deregister_track(src)
+		SSpersistence.objectsDeregisterTrack(src)
 		return
 
 	// Trash-like items should become only persistent when they are not dropped in an area flagged with AREA_FLAG_PREVENT_PERSISTENT_TRASH
@@ -515,12 +515,12 @@
 	if(T)
 		var/area/A = get_area(T)
 		if(A && !(A.area_flags & AREA_FLAG_PREVENT_PERSISTENT_TRASH))
-			persistance_expiration_time_days = 3 // Ensure expiration date is set to prevent long term trash
-			SSpersistence.register_track(src, usr == null ? null : ckey(usr.key))
+			persistant_objects_expiration_time_days = 3 // Ensure expiration date is set to prevent long term trash
+			SSpersistence.objectsRegisterTrack(src, usr == null ? null : ckey(usr.key))
 			return
 
 	// Fallback - No persistency
-	SSpersistence.deregister_track(src)
+	SSpersistence.objectsDeregisterTrack(src)
 
 /obj/item/proc/remove_item_verbs(mob/user)
 	if(ismech(user)) //very snowflake, but necessary due to how mechs work