Add `kwargs` to `ToTensor`, `ToNumpy` and `ToCupy`

[Nic-Ma]

Is your feature request related to a problem? Please describe.
As we are adding more and more args based on torch API or numpy API, I think we should use kwargs directly for future support.
And I will also update the covert_to_type utility to convert dtype and device in 1 call to avoid duplicated copy.

[Nic-Ma]

Hi @wyli @rijobro ,

If you guys don't have concerns, I will make a PR for it today ASAP.

Thanks in advance.

[bhashemian]

Thank you very much @Nic-Ma for taking care of this!
Is there any reason that we can't just add dtype to these APIs? Not having explicit input arguments is a bit strange to me. I know that you are thinking of future addition arguments but I believe we will compromise the APIs to be explicit and self-explanatory, and it might not worth it.