Ultralytics Integration

[guillaume-byte]

Seems like there is a bug between WL UI Eval FN and UL validate decorate as the eval_fn.
Option A:

• Find a way to make it work.
  Option B:
• User-wise function to evaluate from ledger signals only.

And integrate WL to Ultralytics examples.
It seems like instance granularity is not properly working with Ultralytics signals.

Tasks:

• Fix eval_fn fct with Ultralytics
• Integrate WL to UL examples
• Update the detection usecase with instance signals and loss shape