rename array cls -> dtype, accept str or np.dtype#32
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Update the array field decorator signature
array(cls, ...)->array(dtype, ...)wheredtypecan now be astr,np.dtype, ortypeas before. if atypethen we usenp.object_dtype as before. Strings are passed tonp.dtype(), this works for e.g. fixed-length string formats. Obviously dtype itself is allowed too. And if a dtype is provided, enforce it at init/modification time. Add tests.Also remove some unnecessary behavior where list type hints were allowed for the array field decorator.