Add Swin2SR ImageProcessorFast (#37169)
* Add fast image processor support for Swin2SR
* Add Swin2SR tests of fast image processing
* Update docs and remove unnecessary test func
* Fix docstring formatting
* Skip fast vs slow processing test
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Co-authored-by: Yoni Gozlan <74535834+yonigozlan@users.noreply.github.com>
