[Cherrypick] Refactor swin transfomer so its component can be reused on the 3d version#6100

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YosuaMichael merged 2 commits intopytorch:release/0.13from

YosuaMichael:cherrypick/refactor-swin-transformer

May 31, 2022

Commits on May 26, 2022

Refactor swin transfomer so later we can reuse component for 3d version (#6088)
YosuaMichael
committed

Commits on May 31, 2022

Merge branch 'release/0.13' into cherrypick/refactor-swin-transformer
YosuaMichael
committed