adding diagnostic aggregator and its related config file under config/diag_agg.yaml

Conflicts:

	husky_bringup/launch/core/helpers.launch
removing dynamic reconfigure from dead_reckoning because it was only there for handling gyro correctioon (which is not needed

Conflicts:

	nodes/basic_odom_publisher
removing imu processing by dead_reckoning.py

Conflicts:

	nodes/basic_odom_publisher
Fix diagnostic aggregrator, add dependency to package.xml