[Features] Planning to support TensorRT for Flux Pipelines

🚀 Hi team,

I’m planning to code all Flux Pipelines with TensorRT support.
My plan is to create a new subfolder: `flux-tensorrt` inside the `examples` folder.

Pipelines to be supported:
```
FluxPipeline
FluxImg2ImgPipeline
FluxInpaintPipeline
FluxFillPipeline
FluxKontextPipeline
FluxKontextInpaintPipeline
```

✅ Initial phase: Support for both Flux.Dev and Flux Kontext.
🔜 Next step: Extend to the other pipelines.

📚 Some related references for Flux Kontext:

- https://blogs.nvidia.com/blog/rtx-ai-garage-flux-kontext-nim-tensorrt/

- https://github.com/NVIDIA/TensorRT/pull/4548