Include build trt dependencies

[pschroedl]

Replaces build_trt.py dependency on having a cloned copy of ComfyUI with the custom node ComfyUI_TensorRT in filesystem, with locally copied source from https://github.com/yondonfu/ComfyUI_TensorRT

This unblocks @eliteprox PR : #40

Additionally, adds a if __name__ == "__main__": check to setup_models.py and setup_nodes.py

As before, script should be invoked with the full path and filename of output script ( escaping $stat as necessary ):

python src/comfystream/scripts/build_trt.py \
--model /ComfyUI/models/checkpoints/SD1.5/dreamshaper-8.safetensors \
--out-engine /ComfyUI/output/tensorrt/static-dreamshaper8_SD15_/$stat-b-1-h-512-w-512_00001_.engine

[eliteprox]

Do we need all of the comfy_extras files? @pschroedl

[eliteprox]

This is resolved by #89, closing