Validate `datapackage.json` checksums against Zenodo checksums

[E. Belfer]

To catch files that have incorrectly uploaded to Zenodo, we should add a validation to AbstractDatasetArchiver.validate_dataset() that compares the checksum for each file reported in the datapackage.json (generated based on the local file) and the checksum reported for the same file when getting the record from Zenodo (see, e.g., https://zenodo.org/api/records/11408171).

If these are not the same, this is a way to catch incomplete/corrupted file uploads, which should produce a validation failure.