Add analytics

[kjschmidt913]

From proposal, we should track:

Users (authors of datasets. Can we track data user number by the globus accounts used to download the data?)
Citations to hosted datasets

from Ben: Track number of installs of foundry_ml
from Ari: looks like tracking installs may be unreliable? tbd https://pypistats.org/packages/foundry-ml
Ben and I discussed tracking users via Globus credentials, since we need to abstract away Globus anyways

[ascourtas]

blocked by #216

[kjschmidt913]

Updated metric list to reflect our needs