fix: update file paths for downloaded files and saved questions to ensure proper directory structure

fix: update docstring to clarify script functionality for fetching questions and downloading files

feat: implement file download functionality in get_all_questions

remove pdf

feat: implement functions to load GAIA questions and validation records

feat: add accessibility check for GPT4All library and model initialization

feat: add evaluation and submission utilities for GAIA project

feat: add basic API utilities