Started work on library scanning

api/funkwhale_api/federation/library.py

api/funkwhale_api/federation/models.py

api/funkwhale_api/federation/serializers.py

api/funkwhale_api/federation/tasks.py

api/funkwhale_api/radios/models.py

api/tests/federation/test_serializers.py

api/tests/federation/test_tasks.py

front/src/components/federation/LibraryForm.vue

front/src/views/federation/LibraryDetail.vue