Add support for FIFO for accelerometer and gyroscope data #21
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This adds support for using the FIFO queue to store the values measured by the accelerometer and the gyroscope and to read back that data quickly.
It is based on the code from https://github.com/wollewald/ICM20948_WE but includes a small improvement to extract the data faster.
Using the FIFO it is possible to sample data continuously at the maximum sample rate without dropping a single measurement by
When sampling both the accelerometer and the gyroscope, the order is always accelerometer data first, then gyroscope data, assuming the same sample rate. Using this code with a different sample rate for the accelerometer and gyroscope is untested behavior.