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4125756e - Refactor cross attention and allow mechanism to tweak cross attention function (#1639)

Refactor cross attention and allow mechanism to tweak cross attention function (#1639) * first proposal * rename * up * Apply suggestions from code review * better * up * finish * up * rename * correct versatile * up * up * up * up * fix * Apply suggestions from code review * make style * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> * add error message Co-authored-by: Pedro Cuenca <pedro@huggingface.co>