[crazyflie_platform] Add ATTITUDE mode

[pariaspe]

crazyflie.h --> sendSetpoint()

[miferco97]

Think if this should be implemented in AS2 or we should not implement this low level

[miferco97]

This should be attitude since the function is :

For measuring the correspondence between Thrust (in grams) to the corresponding u16_t value ( PWM between 0 and 65536) there is some information on bitcraze webpage https://www.bitcraze.io/2015/02/measuring-propeller-rpm-part-3/

TODO is left in ownSendCommands() methods on file https://github.com/aerostack2-developers/crazyflie_platform/blob/main/src/crazyflie_platform.cpp