Add a new function to retrieve Accelerometer and Gyroscope Data at the Same Time

[bobfrancis1980]

I added the function AccelGyro myself to BoschSensorClass.h and BMI270.cpp in a copy in my Arduino libraries folder to see if it would speed up the time it takes to retrieve the Accelerometer and Gyroscope data and it did. It nearly cut the time in half compared to calling the functions separately.

I would like to add the function to the official code for others to use in case they too have time sensitive code that could use the speed boost.