[Enhancement] Add a visualize script for inference result comparation.

[IRONICBo]

Motivation

1. add a visualization script to visualize the backend inference results, refer to the visualization section in tools/deploy.py
2. script parameters include deployment config, model config, backend model path, image list, pytorch model (ckpt, optional), visualization result save path, etc.
3. require that when the pytorch model is passed in, the back-end results and the pytorch results graph are concatenated for comparison

Modification

tools/visualize.py

Use cases (Optional)

Run command:

python mmdeploy/tools/visualize.py \
    --deploy-cfg mmdeploy/configs/mmdet/detection/detection_onnxruntime_dynamic.py \
    --model-cfg mmdetection/configs/faster_rcnn/faster-rcnn_r50_fpn_1x_coco.py \
    --deploy-path mmdeploy_model/faster-rcnn/end2end.onnx \
    --checkpoint checkpoints/faster_rcnn_r50_fpn_1x_coco_20200130-047c8118.pth \
    --test-img mmdetection/demo/demo.jpg mmdetection/demo/demo2.jpg \
    --save-dir mmdeploy_model/faster-rcnn \
    --device cuda

Inference result: