Add Mealie integration (#119678)

CODEOWNERS

homeassistant/components/mealie/__init__.py

homeassistant/components/mealie/calendar.py

homeassistant/components/mealie/config_flow.py

homeassistant/components/mealie/const.py

homeassistant/components/mealie/coordinator.py

homeassistant/components/mealie/entity.py

homeassistant/components/mealie/manifest.json

homeassistant/components/mealie/strings.json

homeassistant/generated/config_flows.py

homeassistant/generated/integrations.json

requirements_all.txt

requirements_test_all.txt

tests/components/mealie/__init__.py

tests/components/mealie/conftest.py

tests/components/mealie/fixtures/get_mealplan_today.json

tests/components/mealie/fixtures/get_mealplans.json

tests/components/mealie/snapshots/test_calendar.ambr

tests/components/mealie/snapshots/test_init.ambr

tests/components/mealie/test_calendar.py