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dfcce3ca - [Research folder] Add SDXL example (#5275)

[Research folder] Add SDXL example (#5275) * [SDXL Flax] Add research folder * Add co-author Co-authored-by: Juan Acevedo <jfacevedo@google.com> --------- Co-authored-by: Juan Acevedo <jfacevedo@google.com>