add per-role Octopus teams

district/blocks.py

district/management/commands/octopus_people_import.py

district/migrations/0297_alter_districtpeoplepage_content.py

...98_districtoctopuspersonpage_originating_role_and_more.py

district/models.py

district/tasks.py

district/templatetags/district_people_filters.py

shared/people_import.py