MLyBurst, GWAK, and query improvements

docs/user_docs/source/models.rst

docs/user_docs/source/queries.rst

gracedb/api/v1/events/views.py

gracedb/api/v1/superevents/filters.py

...db/events/management/commands/fix-labelling-duplicates.py

gracedb/events/migrations/0096_add_gwak_pipeline.py

gracedb/events/migrations/0097_gwak_mlyburstevent_fields.py

gracedb/events/migrations/0098_mlyburstevent_channel.py

gracedb/events/migrations/0099_mock_label.py

...events/migrations/0100_alter_labelling_unique_together.py

...01_remove_mlyburstevent_channel_mlyburstevent_channels.py

gracedb/events/models.py

gracedb/events/templatetags/mediaviews.py

gracedb/events/tests/test_label_search.py

gracedb/events/translator.py

gracedb/events/view_logic.py

gracedb/events/view_utils.py

gracedb/events/views.py

gracedb/migrations/guardian/0025_populate_gwak_uploaders.py

gracedb/search/fields.py