Update all `Array` properties so we can automatically convert those from "alfacase"

[prusse-martin]

Update all Array properties, like:

alfasim-sdk/src/alfasim_sdk/_internal/alfacase/case_description.py

Lines 504 to 505 in d1ffaf2

	time: Array = attr.ib(default=Array([0], "s"), validator=instance_of(Array))
	speed: Array = attr.ib(default=Array([500], "rpm"), validator=instance_of(Array))

to populate the attrib metadata, like:

alfasim-sdk/src/alfasim_sdk/_internal/alfacase/case_description.py

Lines 217 to 221 in d1ffaf2

	tracer_mass_fraction: Array = attr.ib(
	default=Array([], "-"),
	validator=instance_of(Array),
	metadata={"type": "array", "category": "mass fraction"},
	)

so we can use get_case_description_attribute_loader_dict to automatically convert those from "alfacase".

The ideal solution would be to use a helper function like:

alfasim-sdk/src/alfasim_sdk/_internal/alfacase/case_description_attributes.py

Lines 204 to 217 in d1ffaf2

	def attrib_scalar(
	default: Union[ScalarLike, AttrNothingType] = attr.NOTHING,
	is_optional: bool = False,
	category: Optional[str] = None,
	) -> attr._make._CountingAttr:
	"""
	Create a new attr attribute with a converter to Scalar accepting also tuple(value, unit).
	:param default:
	Value to be used as default when instantiating a class with this attr.ib
	If a default is not set (``attr.NOTHING``), a value must be supplied when instantiating;
	otherwise, a `TypeError` will be raised.
	"""

Some usages of attrib_scalar:

alfasim-sdk/src/alfasim_sdk/_internal/alfacase/case_description.py

Line 100 in d1ffaf2

position = attrib_scalar(category="length")

alfasim-sdk/src/alfasim_sdk/_internal/alfacase/case_description.py

Line 173 in d1ffaf2

trend_frequency = attrib_scalar(default=Scalar(0.1, "s"))