Refactor component

[golles]

Tasks:

• [x] Trigger coordinator.async_config_entry_first_refresh for first reading
• [x] Add typing
• [x] Log error when all readings fail
• [x] Fix m3 units to m³
• [x] Create sensors based on a list[SensorEntityDescription]
• [x] Keep backward compatibility (entity_id)
• [x] Make the KamstrupUpdateCoordinator only read meter values for enabled sensors (so users can choose what they want)
• [x] only read one four value when adding the integration
• [x] Enable all uncommented sensors (so users can choose what they want)
• [x] Uncomment entity_registry_enabled_default=False for sensors that should be disabled by default (only interesting ones should be enabled by default)
• [x] Move sensor DESCRIPTIONS to sensor.py
• [x] Set homeassistant in hacs.json to 2022.11.0
• [x] Add gas sensor
• [x] Update readme with new screenshots
• [x] Fix failing test

Nice to have:

• [ ] Read multiple values at once #29
• [x] add conversion sensor for the energy dashboard

[golles]

Tested update from 1.3.0 to 2.0.0, all good

[Wipnose]

Many thanks