drivers: sensor: adxl367: Added RTIO stream

Updated ADXL367 driver with RTIO stream functionality.
RTIO stream is using both FIFO threshold and FIFO full triggers.
Together with RTIO stream, RTIO async read is also implemented.
Supported FIFO_CHANNEL configurations:
- XYZ
- X
- Y
- Z
- XYZT
- XT
- YT
- ZT
Configurations with external ADC are currently not supported.

Signed-off-by: Vladislav Pejic <vladislav.pejic@orioninc.com>