[CodeCamp2023-543] Adapt new version of Config

[ljqiff]

把旧的config改了，包括：采用了import，去掉了type的单引号，还有最后面的default_hooks.update
问题：uniformerv2-base-p16-res224_clip_u8_kinetics710-rgb.py文件中的ConcatDataset类型在mmaction.datasets没有

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[ljqiff]

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[Dai-Wenxun]

问题：uniformerv2-base-p16-res224_clip_u8_kinetics710-rgb.py文件中的ConcatDataset类型在mmaction.datasets没有

The class ConcatDataset is registered in mmengine, not mmaction2.

[codecov]

Codecov Report

Attention: 1888 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
mmaction/apis/__init__.py	100.00% <ø> (ø)
...maction/apis/inferencers/actionrecog_inferencer.py	74.07% <100.00%> (ø)
mmaction/datasets/__init__.py	100.00% <100.00%> (ø)
mmaction/datasets/ava_dataset.py	86.46% <ø> (ø)
mmaction/datasets/transforms/__init__.py	100.00% <100.00%> (ø)
mmaction/datasets/transforms/loading.py	81.73% <100.00%> (+0.40%)	⬆️
mmaction/datasets/transforms/processing.py	79.85% <ø> (ø)
mmaction/engine/runner/__init__.py	100.00% <100.00%> (ø)
...maction/evaluation/functional/multisports_utils.py	64.05% <100.00%> (+0.23%)	⬆️
mmaction/evaluation/metrics/__init__.py	100.00% <100.00%> (ø)
... and 49 more

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