drivers/sensor/bmi323: Add BMI323 driver support

This PR adds a driver for the BMI323, which implements
the following features:

* Enable and disable accelerometer and gyroscope respectively
* Set full scale for accelerometer and gyroscope respectively
* Set data rate for accelerometer and gyroscope respectively
* Get samples (x,y,z) from accelerometer and gyroscope respectively
* Get die temperature
* Set trigger to accelerometer data ready, and accelerometer any motion.

The driver implements device and device runtime power management. If
runtime management is used, it is initialized into the suspended state,
which soft-resets the device to achieve the lowest possible power
consumption, otherwise it is resumed when initialized. When resumed,
the bus is initialized, the feature engine is enabled, and INT1 is
initialized.

The driver only implements the SPI bus at this time. The driver is
prepared to be expanded with I2C support in the future.

Signed-off-by: Bjarki Arge Andreasen <baa@trackunit.com>