Unable to access pure ToF image

[stephen-systemfriend]

Is there any way we can get just the Tof image back from the Depth API for devices that have it? Right now the return seems to be a fusion of the ToF data and the calculations from color, but we have some use cases where we would do better with the data exactly as it is recieved from the camera. If we access the ToF camera directly then ARCore is unable to use it, which I assume hampers SLAM performance, and means the depth API calls we might use for occlusion would be worse.

I am happy to submit a pull request for any changes if there is a way to do this.