[Feature] Support TSP6K dataset(CVPR'2024)

[YuqiYang213]

Motivation

Add TSP6K dataset described in "Traffic Scene Parsing through the TSP6K Dataset" which is the largest traffic monitoring datasets and contains much more crowded scenes than the present traffic scene parsing datasets.

Modification

• Add TSP6K data loader and config file.
• Add the dataset converter code for TSP6K.
• Add the tutorial and introduction in documents.

Use cases (Optional)

To train a model with the TSP6K dataset, we can use the following command:
bash tools/dist_train.sh configs/deeplabv3plus/deeplabv3plus_r50b-d8_4xb2_80k_tsp6k_769x769.py 2 --work-dir work_dirs/test_running

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