Introduce new Unroll And Jam loop transform for SCF/Affine loops

Hi,

I found Unroll & Jam transform useful for some cases I am solving.
The idea of unroll is desribed in the discussion here (see summary).

I wrote PR that exposes the implementation done to Affine dialect and in addition added partial support to SCF dialect.

Feel free to code review and give some comments:

Thanks,
Aviad

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