Add `depthai` (OpenCV AI Kit) integration

Would be useful to improve OpenCV AI Kit cameras integration by creating a [`depthai.Device`](https://docs.luxonis.com/projects/api/en/latest/components/device/)-based `VideoSource`, similar to [`ScreenSource`](https://github.com/ES-Alexander/pythonic-cv/blob/master/src/pcv/screen.py#L12) for `mss` integration.