[CoreML] Make diffusers work natively with Mac CoreML

[patrickvonplaten]

Required changes to make diffusers work out of the book with CoreML: https://gist.github.com/madebyollin/86b9596ffa4ab0fa7674a16ca2aeab3d?permalink_comment_id=4295017

[patrickvonplaten]

cc @pcuenca @anton-l @patil-suraj

[pcuenca]

/cc @hollance too.

I can do some testing here.

[patil-suraj]

Fix is here #445, #446

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