Merge branch 'streamer-worker-registry' into 'develop'

lib/pleroma/application.ex

lib/pleroma/web/activity_pub/activity_pub.ex

lib/pleroma/web/mastodon_api/websocket_handler.ex

lib/pleroma/web/streamer/ping.ex

lib/pleroma/web/streamer/state.ex

lib/pleroma/web/streamer/streamer.ex

lib/pleroma/web/streamer/streamer_socket.ex

lib/pleroma/web/streamer/supervisor.ex

lib/pleroma/web/streamer/worker.ex

test/integration/mastodon_websocket_test.exs

test/notification_test.exs

test/support/builders/activity_builder.ex

test/support/conn_case.ex

test/support/data_case.ex

test/web/streamer/ping_test.exs

test/web/streamer/state_test.exs

test/web/streamer/streamer_test.exs