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7200daa4 - Support saving multiple t2i adapter models under one checkpoint (#4798)

Support saving multiple t2i adapter models under one checkpoint (#4798) * adding save and load for MultiAdapter, adding test * Apply suggestions from code review Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com> * Adding changes from review test_stable_diffusion_adapter * import sorting fix --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>