New task checking if remote instance is reachable to avoid playback latence

api/config/settings/common.py

...whale_api/audio/migrations/0004_alter_channel_metadata.py

...unkwhale_api/common/migrations/0009_auto_20220622_1202.py

api/funkwhale_api/federation/factories.py

...hale_api/federation/migrations/0027_auto_20220622_1202.py

api/funkwhale_api/federation/models.py

api/funkwhale_api/federation/tasks.py

...hale_api/moderation/migrations/0007_auto_20220622_1202.py

...funkwhale_api/music/migrations/0055_auto_20220622_1202.py

api/funkwhale_api/music/models.py

...unkwhale_api/radios/migrations/0006_alter_radio_config.py

...unkwhale_api/users/migrations/0022_alter_user_settings.py

api/tests/federation/test_tasks.py

changes/changelog.d/1711.enhancement