Add OdometryAttitude class

[GuillaumeLaine]

Changes

• Add OdometryAttitude class.
• Add heading() getter to OdometryLocalPosition class.
• Use these interfaces in examples.

Note

OdometryAttitude::yaw() and OdometryLocalPosition::heading() return the same value (up to PX4 timing), but I think it still makes sense to add a OdometryLocalPosition::heading() method for cases where the local position is already subscribed to e.g. in our local goto example.

JIRA: APX4-3816