Convert rest sensors to async using httpx (#41973)

.coveragerc

homeassistant/components/pvoutput/sensor.py

homeassistant/components/rest/binary_sensor.py

homeassistant/components/rest/manifest.json

homeassistant/components/rest/sensor.py

homeassistant/components/scrape/sensor.py

requirements_all.txt

requirements_test.txt

requirements_test_all.txt

tests/components/rest/test_binary_sensor.py

tests/components/rest/test_sensor.py

tests/fixtures/rest/configuration.yaml