Provide complete TEB config as JSON

• Instead of setting the TEB weights within the code (TimedElasticBands::initConfig()), a JSON file should be created which holds the parameters in the same format (same structure as TEB).
• the structure must be replicated in ARON (local_planning/aron/TimedElasticBands.xml)
• JSON -> ARON is natively available. However, the conversion ARON -> teb_local_planner::TebConfig must be added to local_planning/aron_conversions.