[CodeCamp2023-545] Support video retrieval dataset MSVD

[xiaoyi0919]

支持 MSVD 视频检索数据集

Support MSVD video retrieval dataset in mmaction2, including the original dataset download and processing scripts (the processed data should be located in the data/video_retrieval/msvd directory and conform to the mmaction2 video retrieval task data format, which can refer to the already supported MST-VTT dataset), download and processing scripts can refer to prepare_msrvtt.py and prepare_msrvtt.sh in tools/data/video_retrieval, and need to update the README under tools/data/video_retrieval, mainly including the dataset citation and introduction, the invocation method of download and processing scripts, and the data directory structure tree after processing.

在 mmaction2 中支持 MSVD 视频检索数据集，包括原始数据集下载和处理脚本（经过处理后的数据应位于 data/video_retrieval/msvd 目录下且符合 mmaction2 视频检索任务数据格式，可参考已经支持的 MST-VTT 数据集），下载和处理脚本可参考 tools/data/video_retrieval 下的 prepare_msrvtt.py 和 prepare_msrvtt.sh，并且需要更新 tools/data/video_retrieval 下的 README，主要包括主要包括数据集的引用和简介、下载处理脚本的调用方法和处理完成的数据目录结构树。

[CLAassistant]

All committers have signed the CLA.

[Dai-Wenxun]

Excellent job! We'll review your code next week, please keep in touch.

[Dai-Wenxun]

Could you please push the commits to dev-1.x branch?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.18% 🎉

Comparison is base (1405434) 75.99% compared to head (32436ed) 76.17%.
Report is 231 commits behind head on dev-1.x.

❗ Current head 32436ed differs from pull request most recent head b989872. Consider uploading reports for the commit b989872 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2622      +/-   ##
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+ Coverage    75.99%   76.17%   +0.18%     
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  Files          151      170      +19     
  Lines        11376    13798    +2422     
  Branches      1881     2362     +481     
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+ Hits          8645    10511    +1866     
- Misses        2298     2719     +421     
- Partials       433      568     +135     

Flag	Coverage Δ
unittests	76.17% <ø> (+0.18%)	⬆️

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[OpenMMLab-Assistant-004]

Hi @xiaoyi0919,

We'd like to express our appreciation for your valuable contributions to the mmaction2. Your efforts have significantly aided in enhancing the project's quality.
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