sensors: vertically decode raw data

Update the decoder APIs to vertically decode the raw sensor data. This
means that instead of getting each channel on a frame by frame basis,
the API takes a channel specifier and returns as many frames of that
given channel as there's room.

The goal of this is to make the end decoded result the most useful and
usable for the Zephyr application. See #60944 for details.

Signed-off-by: Yuval Peress <peress@google.com>