add icecube pipeline

docs/user_docs/source/dicts/event_external_grb.json

docs/user_docs/source/dicts/event_external_neutrino.json

docs/user_docs/source/dicts/event_ml.json

docs/user_docs/source/models.rst

gracedb/core/utils.py

gracedb/events/migrations/0091_add_icecube_pipeline.py

gracedb/events/migrations/0092_neutrinoevent.py

gracedb/events/models.py

gracedb/events/translator.py

gracedb/events/view_logic.py

gracedb/events/view_utils.py

gracedb/events/views.py

...db/migrations/guardian/0022_populate_icecube_uploaders.py

gracedb/templates/gracedb/event_detail_GRB.html

gracedb/templates/gracedb/event_detail_NE.html