add support for dynamic data type in transforms

[Nic-Ma]

Is your feature request related to a problem? Please describe.
Need to make all transforms more flexible to handle different data types.

[wyli]

closing this in favour of #2231, see also

MONAI/monai/utils/type_conversion.py

Lines 26 to 36 in 8651b62

	torch.bool: np.dtype(bool),
	torch.uint8: np.dtype(np.uint8),
	torch.int8: np.dtype(np.int8),
	torch.int16: np.dtype(np.int16),
	torch.int32: np.dtype(np.int32),
	torch.int64: np.dtype(np.int64),
	torch.float16: np.dtype(np.float16),
	torch.float32: np.dtype(np.float32),
	torch.float64: np.dtype(np.float64),
	torch.complex64: np.dtype(np.complex64),
	torch.complex128: np.dtype(np.complex128),