[Stats] Moved Stats class from math to utils folder

old_examples/tests/catch/misc/xbee-bitrate.cpp

old_examples/tests/catch/misc/xbee-send-rcv.cpp

old_examples/tests/catch/misc/xbee-time-to-send.cpp

old_examples/tests/drivers/test-imu-adis.cpp

old_examples/tests/drivers/test-lsm.cpp

src/entrypoints/sdcard-benchmark.cpp

src/shared/radio/Xbee/XbeeStatus.h

src/shared/scheduler/TaskScheduler.h

src/shared/scheduler/TaskSchedulerData.h

src/shared/sensors/analog/pressure/honeywell/SSCDRRN015PDA.h

src/shared/utils/Stats/Stats.cpp

src/shared/utils/Stats/Stats.h

src/tests/drivers/canbus/test-canbus-2way.cpp

src/tests/drivers/xbee/XbeeTestData.h

src/tests/drivers/xbee/gui/EnergyScanScreen.h

src/tests/sensors/calibration/test-calibration-stats.cpp