Allow inheriting FrozenOrThawed with custom init

[emontnemery]

Proposed change

Allow inheriting FrozenOrThawed with custom __init__

The pattern is used by philips_js in a misguided workaround to allow adding fields without default values in a subclass:

core/homeassistant/components/philips_js/binary_sensor.py

Lines 21 to 28 in a6f3d19

	@dataclass
	class PhilipsTVBinarySensorEntityDescription(BinarySensorEntityDescription):
	"""A entity description for Philips TV binary sensor."""
	def __init__(self, recording_value, *args, **kwargs) -> None:
	"""Set up a binary sensor entity description and add additional attributes."""
	super().__init__(*args, **kwargs)
	self.recording_value: str = recording_value

While philips_js should just set the kw_only flag to True, we should still allow this to lessen the risk of breaking similar patterns in custom integrations.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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