Add data downloading functionality and gdown dependency for test setup

[romeokienzler]

This pull request updates the integration test workflow to use pre-generated data downloaded from Google Drive instead of generating data locally. It introduces the gdown library as a new dependency and modifies the test logic to automate the download and extraction of the dataset if not already present.

Dependency and test workflow updates:

• Added gdown as a dependency in pyproject.toml to enable downloading files from Google Drive.
• Updated integrationtests/test_base_set.py to import gdown and zipfile for handling dataset downloads and extraction.

Test data handling improvements:

• Modified the test_train function in integrationtests/test_base_set.py to:
  • Download a pre-generated dataset from Google Drive using gdown if the data_out directory is missing or empty.
  • Extract the downloaded zip file and clean up after extraction.
  • Skip the previous in-place dataset generation steps (now commented out).

[albanpuech]

Thank you so much @romeokienzler !!!!!!!

[albanpuech]

APPROVED!
could you just add in the README some instructions for running the integration test?

Thank you!