Implemented functionality where user can search for traps in some chests

This is my first PR on this project, so any feedback is welcome :)

I've tested it locally and it works fine, it lets player to search for traps in chests, has cooldown with specific timers and rewards. I've refactored some code in ThieveOther class (com.rs2.game.content.skills.thieving) and also addOrDropItem method in ItemAssistant class (com.rs2.game.items) to be able to drop item if player does not have stackable item and doesn't have space.

Let me know what you think :)

I guess it could close this issue

Thank you