Implemented basic study flow in with the study server. Added Controls tutorial.

overcooked_simulator/__main__.py

overcooked_simulator/example_study_server.py

overcooked_simulator/game_content/environment_config.yaml

...ooked_simulator/game_content/environment_config_dark.yaml

overcooked_simulator/game_content/study_config.yaml

overcooked_simulator/game_content/tutorial/tutorial.layout

..._simulator/game_content/tutorial/tutorial_env_config.yaml

overcooked_simulator/game_server.py

overcooked_simulator/gui_2d_vis/gui_theme.json

overcooked_simulator/gui_2d_vis/overcooked_gui.py

...ooked_simulator/gui_2d_vis/tutorial_files/recipe_mock.png

...d_simulator/gui_2d_vis/tutorial_files/tutorial.drawio.png

overcooked_simulator/overcooked_environment.py