System Architecture documentation

[DeltaDizzy]

Draw.io flowcharts to describe the startup and dataflow of PhotonVision are needed, both for general knowledge and to onboard new contributors.

• Application init
• Coprocessor dataflow (from init to streams, targets, results published on NT)
  • AprilTagPipeline
  • ColoredShapePipeline
  • ObjectDetectionPipeline
  • ArucoPipeline?
  • CalibrationPipeline?
• PhotonLib dataflow (from PhotonCamera init to pose estimate available)
• OD dataflow (how the model management system works)