Add args description to DatasetInfo
{'login': 'lewtun', 'id': 26859204, 'node_id': 'MDQ6VXNlcjI2ODU5MjA0', 'avatar_url': 'https://avatars.githubusercontent.com/u/26859204?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/lewtun', 'html_url': 'https://github.com/lewtun', 'followers_url': 'https://api.github.com/users/lewtun/followers', 'following_url': 'https://api.github.com/users/lewtun/following{/other_user}', 'gists_url': 'https://api.github.com/users/lewtun/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/lewtun/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/lewtun/subscriptions', 'organizations_url': 'https://api.github.com/users/lewtun/orgs', 'repos_url': 'https://api.github.com/users/lewtun/repos', 'events_url': 'https://api.github.com/users/lewtun/events{/privacy}', 'received_events_url': 'https://api.github.com/users/lewtun/received_events', 'type': 'User', 'site_admin': False}
[]
[]
["Thanks for the suggestions! I've included them and made a few minor tweaks along the way"
 'Please merge master into this branch to fix the CI, I just fixed metadata validation tests.']
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Closes #2354 

I am not sure what `post_processed` and `post_processing_size` correspond to, so have left them empty for now. I also took a guess at some of the other fields like `dataset_size` vs `size_in_bytes`, so might have misunderstood their meaning.
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