Raspberry Pi Pico port for Bosch Sensortec BNO-055 driver.

To add to your project:

• Copy BNO055_driver folder to your project.
• Add "pico_bno055" to your target_link_libraries in CMake.

Added convenience function:

• Use bno055_pico_init() to initiliaze the sensor struct so that you don't have to manually set function pointers to i2c functions.