Description:
casting a TorchTensor NdArray fails

How to reproduce:

from docarray import BaseDoc
from docarray.typing import NdArray
import torch

class MyDoc(BaseDoc):
    tens: NdArray

t1 = torch.rand(512)
doc = MyDoc(tens=t1)

  Expected a numpy.ndarray compatible type, got <class 'torch.Tensor'> (type=value_error)

TODO:

• Fix this in the validate function of NdArray
• what about coercions to/from tf? do we have tests for this?