[Feature] Add min_size arg in Resize to keep the shape after resize bigger than slide window

[linfangjian01]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

add setr_resize

Modification

add setr_resize

[codecov]

Codecov Report

Merging #1318 (ebd33e0) into master (e5cd755) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1318      +/-   ##
==========================================
+ Coverage   90.24%   90.27%   +0.02%     
==========================================
  Files         131      131              
  Lines        7599     7621      +22     
  Branches     1264     1267       +3     
==========================================
+ Hits         6858     6880      +22     
  Misses        531      531              
  Partials      210      210              

Flag	Coverage Δ
unittests	90.27% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmseg/datasets/pipelines/transforms.py	98.06% <100.00%> (+0.03%)	⬆️
mmseg/models/decode_heads/dnl_head.py	93.75% <0.00%> (ø)
mmseg/models/decode_heads/fcn_head.py	100.00% <0.00%> (ø)
mmseg/models/decode_heads/psp_head.py	100.00% <0.00%> (ø)
mmseg/models/decode_heads/aspp_head.py	100.00% <0.00%> (ø)
mmseg/models/decode_heads/uper_head.py	100.00% <0.00%> (ø)

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[MeowZheng]

Add UTs for this new feature

[Junjun2016]

CI failed.

[jason102811]

linfangjian01，您好！您在MMSeg项目中给我们提的PR非常重要，感谢您付出私人时间帮助改进开源项目，相信很多开发者会从你的PR中受益。
我们非常期待与您继续合作，OpenMMLab专门成立了贡献者组织MMSIG，为贡献者们提供开源证书、荣誉体系和专享好礼，可通过添加微信：openmmlabwx 联系我们（请备注mmsig+GitHub id），由衷希望您能加入！
Dear linfangjian01,
First of all, we want to express our gratitude for your significant PR in the MMSeg project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.
We are looking forward to continuing our collaboration with you. OpenMMLab has established a special contributors' organization called MMSIG, which provides contributors with open-source certificates, a recognition system, and exclusive rewards. You can contact us by adding our WeChat（if you have WeChat): openmmlabwx, or join in our discord： https://discord.gg/qH9fysxPDW. We sincerely hope you will join us!
Best regards！ @linfangjian01