Add Nord Pool integration (#129983)

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CODEOWNERS

homeassistant/components/nordpool/__init__.py

homeassistant/components/nordpool/config_flow.py

homeassistant/components/nordpool/const.py

homeassistant/components/nordpool/coordinator.py

homeassistant/components/nordpool/entity.py

homeassistant/components/nordpool/icons.json

homeassistant/components/nordpool/manifest.json

homeassistant/components/nordpool/sensor.py

homeassistant/components/nordpool/strings.json

homeassistant/generated/config_flows.py

homeassistant/generated/integrations.json

mypy.ini

requirements_all.txt

requirements_test_all.txt

tests/components/nordpool/__init__.py

tests/components/nordpool/conftest.py

tests/components/nordpool/fixtures/delivery_period.json

tests/components/nordpool/snapshots/test_sensor.ambr