feat: download option and verify integrity before loading

[rkansal47]

• add download option for each dataset (False by default to match torchvision)
• check integrity of dataset before loading as well
• tests of these for all datasets

Follow-up on #49.

[jmduarte]

The code looks fine, but I was wondering:
(1) why aren't the CI tests running?
(2) when I try to run tests locally on this branch (and also on main):

pytest -n 0 --durations 0 -v -m "not slow" tests/datasets/test_jetnet.py

I see the following:

================================================================== test session starts ===================================================================
platform darwin -- Python 3.10.8, pytest-7.4.2, pluggy-1.3.0 -- /opt/miniconda3/envs/jetnet/bin/python3.10
cachedir: .pytest_cache
rootdir: /Users/jduarte/Dropbox/jetnet
configfile: pyproject.toml
plugins: xdist-3.3.1
collected 15 items                                                                                                                                       

tests/datasets/test_jetnet.py::test_getData[30-g-177252-0] FAILED                                                                                  [  6%]
tests/datasets/test_jetnet.py::test_getData[30-q-170679-1] FAILED                                                                                  [ 13%]
tests/datasets/test_jetnet.py::test_getData[30-jet_types2-347931-None] FAILED                                                                      [ 20%]
tests/datasets/test_jetnet.py::test_getData[75-g-177252-0] FAILED                                                                                  [ 26%]
tests/datasets/test_jetnet.py::test_getData[75-q-170679-1] FAILED                                                                                  [ 33%]
tests/datasets/test_jetnet.py::test_getData[75-jet_types2-347931-None] FAILED                                                                      [ 40%]
tests/datasets/test_jetnet.py::test_getDataFeatures[30] FAILED                                                                                     [ 46%]
tests/datasets/test_jetnet.py::test_getDataFeatures[75] FAILED                                                                                     [ 53%]
tests/datasets/test_jetnet.py::test_getDataSplitting[30] FAILED                                                                                    [ 60%]
tests/datasets/test_jetnet.py::test_getDataSplitting[75] FAILED                                                                                    [ 66%]
tests/datasets/test_jetnet.py::test_getDataErrors FAILED                                                                                           [ 73%]
tests/datasets/test_jetnet.py::test_DataClass[30] FAILED                                                                                           [ 80%]
tests/datasets/test_jetnet.py::test_DataClass[75] FAILED                                                                                           [ 86%]
tests/datasets/test_jetnet.py::test_DataClassNormalisation[30] FAILED                                                                              [ 93%]
tests/datasets/test_jetnet.py::test_DataClassNormalisation[75] FAILED                                                                              [100%]

======================================================================== FAILURES ========================================================================

with all having a similar error message:

================================================================ short test summary info =================================================================
FAILED tests/datasets/test_jetnet.py::test_getData[30-g-177252-0] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getData[30-q-170679-1] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getData[30-jet_types2-347931-None] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getData[75-g-177252-0] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getData[75-q-170679-1] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getData[75-jet_types2-347931-None] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getDataFeatures[30] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getDataFeatures[75] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getDataSplitting[30] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getDataSplitting[75] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_getDataErrors - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_DataClass[30] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_DataClass[75] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_DataClassNormalisation[30] - KeyError: 'key'
FAILED tests/datasets/test_jetnet.py::test_DataClassNormalisation[75] - KeyError: 'key'
================================================================== 15 failed in 15.01s ===================================================================

is this a known (separate) issue?

[rkansal47]

@jmduarte This was due to Zenodo updating their API last week. CI is running and passing now after #58.