add duecredit support for dandisets

not exactly "documentation" but idea/reminder-bell came up during docathon: would be nice to add duecredit support upon access to some dandiset (local or remote) by calling `due.cite` on that dandiset. We have similar functionality in datalad (although it is messier there since there is no harmonized metadata there): https://github.com/datalad/datalad/blob/99bac031981f1e26585d3fb3d840539c645e174c/datalad/distribution/dataset.py#L297