Add Intellifire Gas Fireplace integration (#63637)

.coveragerc

CODEOWNERS

homeassistant/components/intellifire/__init__.py

homeassistant/components/intellifire/binary_sensor.py

homeassistant/components/intellifire/config_flow.py

homeassistant/components/intellifire/const.py

homeassistant/components/intellifire/coordinator.py

homeassistant/components/intellifire/manifest.json

homeassistant/components/intellifire/strings.json

homeassistant/components/intellifire/translations/en.json

homeassistant/generated/config_flows.py

requirements_all.txt

requirements_test_all.txt

tests/components/intellifire/__init__.py

tests/components/intellifire/test_config_flow.py