add progressbar to unipc sampler

[vladmandic]

add console progress bar (tqdm) as it is present in all other samplers plus reduce verbosity of unipc sampling

[pamparamm]

I think for-loop with low order DPM pass should also be represented in progressbar (as a separate bar or perhaps concatenated with the main one)

[vladmandic]

I think for-loop with low order DPM pass should also be represented in progressbar (as a separate bar or perhaps concatenated with the main one)

To be uniform, there is only one progress bar per op.
Concatenation could be done, but then entire loop should change as those are two separate ranges.