What does this PR do?

Add some utils in mindone.diffusers, including:

BACKENDS_MAPPING containing bs, opencv, ftfy to check if it is available for importing or not

export utils such as export_to_gif, export_to_obj and etc to export outputs of models to specific file format

Before submitting

[ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
[ ] Did you read the contributor guideline?
[ ] Did you make sure to update the documentation with your changes? E.g. record bug fixes or new features in What's New. Here are the documentation guidelines
[ ] Did you build and run the code without any errors?
[ ] Did you report the running environment (NPU type/MS version) and performance in the doc? (better record it for data loading, model inference, or training tasks)
[ ] Did you write any new necessary tests?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag members/contributors who may be interested in your PR.

@geniuspatrick @CaitinZhao