Make yeelight discovery async (#54711)

homeassistant/components/yeelight/__init__.py

homeassistant/components/yeelight/config_flow.py

homeassistant/components/yeelight/light.py

homeassistant/components/yeelight/manifest.json

requirements_all.txt

requirements_test_all.txt

tests/components/yeelight/__init__.py

tests/components/yeelight/test_binary_sensor.py

tests/components/yeelight/test_config_flow.py

tests/components/yeelight/test_init.py

tests/components/yeelight/test_light.py