Better Drive files download failure

Download of drive urls sometimes fails with NonMatchingChecksumError: Artifact https://drive.google.com/... has wrong checksum.

Explanation: Drive sometimes reject the download attempt, and the rejection page is downloaded instead of the data:

• If the user is based in china (should use VPN)
• If there is too many downloads of the same file.

The best solution currently is to manually download the data (https://www.tensorflow.org/datasets/overview#manual_download_if_download_fails), rather than using the automated download which got rejected by drive.

Otherwise:

• Try the download latter on.
• Try on a different computer
• Rather than downloading the file in each colab connection, load the dataset from a GCS bucket. See instructions.

Not sure there can be a solution on Google Drive side, while preventing abuse.
On TFDS side, we could make the error message more explicit when we detect a drive URL.

Start by locating the Drive URL download and checksum-error handling in the TensorFlow Datasets codebase. Reproduce or inspect the reported NonMatchingChecksumError path, then determine where a Drive-specific explanation can be added. Done means rejected Drive downloads provide clearer guidance about manual downloads and retry options.