Add sorting controls on Teams topics page.

...tic/common/js/components/collections/paging_collection.js

common/static/common/js/components/views/paging_header.js

...on/static/common/js/spec/components/paging_header_spec.js

...atic/common/templates/components/paging-header.underscore

common/test/acceptance/pages/lms/teams.py

common/test/acceptance/tests/lms/test_teams.py

lms/djangoapps/teams/static/teams/js/collections/base.js

lms/djangoapps/teams/static/teams/js/views/topics.js