Introduce a streaming API that uses the same data path as the async API.

This includes features to the decoder:
* Checking if triggers are present

Adding streaming features built ontop of existing triggers:
* Adding 3 operations to be done on a trigger
  * include - include the data with the trigger information
  * nop - do nothing
  * drop - drop the data (flush)
* Add a new sensor_stream() API to mirror sensor_read() but add an
optional handler to be able to cancel the stream.

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

Add streaming implementation for icm42688 using both threshold and
full FIFO triggers.

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

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