Add the logic for thwomps to the game

[v1br]

A successful completion of this issue looks like this:

• There are assets for thwomps in the game under public/assets/traps/rock.
• A basic implementation of an animation cycle of one such thwomp is already implemented.
• Use this character as reference: https://www.mariowiki.com/Thwomp
• Then use the provided assets and complete the implementation.
• The thwomp should wait for the player to pass / stand beneath, then smash until it hits ground.
• It should then slowly go back up to its initial position on the map.
• You must use the blink, bottom_hit and idle assets in the animation sequence.