feat: Support passing objects to surfaces in field data.

[prmukherj]

Now we can use field data objects like reduction:

>>> scalar_object_from_surface_objects = ScalarFieldDataRequest(
>>>         field_name="absolute-pressure",
>>>         surfaces=solver.setup.boundary_conditions.velocity_inlet,
>>>     )

>>> field_data.get_field_data(scalar_object_from_surface_objects)

Please refer to the tests for detailed usages.

This PR also contains fix for reduction to avoid using [VelocityInlets] within a list and provides suitable exceptions.