[PaddlePaddle Hackathon] add ShuffleNetV2

[tt8000]

PR types

New features

PR changes

APIs

Describe

• Task:【PaddlePaddle Hackathon】14、在 Paddle 中新增 ShuffleNetV2 #35996

• 向 paddle.vision.models 添加以下模型

  • ShuffleNetV2
  • shufflenet_v2_x0_25
  • shufflenet_v2_x0_33
  • shufflenet_v2_x0_5
  • shufflenet_v2_x1_0
  • shufflenet_v2_x1_5
  • shufflenet_v2_x2_0
  • shufflenet_v2_swish

• 支持预训练模型

• 单元测试

• 文档 [PaddlePaddle Hackathon] add ShuffleNetV2 zh doc docs#3953

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[luotao1]

@tt8000 感谢你在飞桨黑客松1期的贡献，由于 ShuffleNetV2 已经合入#36067，先将这个PR关闭。

• 飞桨黑客松3期 正在进行中，欢迎报名参加。
• 我们正在运营一个Paddle Framework Contributor Club (PFCC) 组织，会通过定期分享技术知识与发布开发者主导任务的形式持续为飞桨框架做贡献，详情可见 https://github.com/luotao1 主页说明。

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