Observability and Control for TensorRT Engine Builds

This feature thread tracks the evolution of making NVIDIA TensorRT engine builds more observable and controllable. Initially, long-running builds lacked visibility, leading to wasted GPU hours and user frustration. Recent advancements, exemplified by the introduction of `IProgressMonitor` in TensorRT, provide fine-grained, thread-safe progress tracking and cancellation capabilities. This allows developers to integrate real-time progress reporting into terminals, IDEs, services, and agent runtimes, and decouples build logic from application-level rendering or streaming.