Resolve "additional state keys and values"

Closes #124

See merge request scs/cocosy/overcooked-simulator!92

Corrected spelling and added information about state content storage. The spelling error related to "hot-plugging" has been corrected. Also, a detail about the new change in state content storage, which is now being held in its own variable instead of passed through a keyword argument to the step function, has been added.

The 'game_ended_step' has been added to both 'environment_config_no_validation.yaml' and 'environment_config.yaml' files. This state will trigger at the end of each game, and now it'll be recognized by the system.

The code now contains a new hook named "additional_state_update" and accommodates accepting additional state content. This functionality is used to better manage player readiness states in the game_server module and includes updates to the get_state and get_json_state methods in the environment module. New changes also impact the environment configuration files.

Resolve "Score green or red when changed"

Closes #121

See merge request scs/cocosy/overcooked-simulator!91

Resolve "Docs for hooks"

Closes #104

See merge request scs/cocosy/overcooked-simulator!86

This change updates the filename to better reflect its purpose. tryout_pearl.py serves as a test environment for the 'PEARL' reinforcement learning algorithm within the Cooperative Cuisine project.

The additional "env_name" parameter has been added to the game server test setup. This addition is intended to further specify the game environment during testing, improving precision and potentially revealing more detailed results.

Several sections of the codebase have been refactored for maintainability. The 'ORDERS' module has witnessed some cleanups and adjustments in the 'create_init_orders' method. Hooks and associated comments were added in the 'hooks' module for better understanding of code functionality. The 'pygame_2d_vis' script's documentation was also improved for clarity.