Integrate Au library for unit conversions

[Tyler-Lentz]

https://github.com/aurora-opensource/au

This library essentially adds compile time checking to all units, and does all dimensional analysis for you so we will never ever mess up units. Would be very epic to add.

List of tasks:

• Generate our own custom header file with the types we need https://aurora-opensource.github.io/au/main/install/#custom-single-file
  • This isn't an exhaustive list but at least want degrees volts meters feet millimeters meters/second feet/second seconds
• Add that custom header file to our repo (maybe in include/utilities/units.hpp)
• Modify XYZCoord to use typed units (meters) and change invocations of XYZCoord https://github.com/tritonuas/obcpp/blob/main/include/utilities/datatypes.hpp#L10
• Declare a new GPSCoord type that's not named GPSCoord so that it doesn't conflict with our existing GPSCoord protobuf struct. Replace all instances of GPSCoord with this new one. Old GPSCoord protobuf is defined here https://github.com/tritonuas/protos/blob/master/obc.proto#L50-L54
• Add types to ImageTelemetry struct on feat/cv-orchestrator in interface.hpp https://github.com/tritonuas/obcpp/blob/feat/cv-orchestrator/include/camera/interface.hpp#L13-L24