testElevator

 An elevator traveling between several floors in a three-dimensional environment.

Elements to be made:
- Doors that can be opened with a button. They contain a photocell - if a player
enters the photocell area, they open again so as not to trap the player. There is
an animation of the door opening.
- Buttons in the elevator. The player uses them to move between floors. After
selecting the floor, door close and the elevator moves to the selected floor.
After reaching the place, the door opens.
- The elevator plays various sounds when it starts, moves and stops.
- There is an elevator call button on each floor of the building.
Please solve the task without using the singleton design pattern and without
methods related to GameObject.Find or Object.FindObjectOfType.