Update Examples to no longer use legacy API

[tsebaschtian]

I found it quite odd that among others the Servo example still uses the canardRequestOrRespond() function that is described in the canard.h file as following:

// Legacy API, try to avoid using it, as this will not be extended with new features
int16_t canardRequestOrRespond(CanardInstance* ins,             ///< Library instance
                               uint8_t destination_node_id,     ///< Node ID of the server/client
                               uint64_t data_type_signature,    ///< See above
                               uint8_t data_type_id,            ///< Refer to the specification
                               uint8_t* inout_transfer_id,      ///< Pointer to a persistent variable with transfer ID
                               uint8_t priority,                ///< Refer to definitions CANARD_TRANSFER_PRIORITY_*
                               CanardRequestResponse kind,      ///< Refer to CanardRequestResponse
                               const void* payload,             ///< Transfer payload
                               uint16_t payload_len             ///< Length of the above, in bytes

If this is legacy API, i would suggest that the examples get updated to use the new and recommended API.
I would do it myself, but i'm not deep enough into how the library is properly used.
Thanks in advance.