added parallel conditional compilation for trace interpolation #659
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Description:
We use Rayon to add parallelization option for interpolating the trace. Each thread runs fft in each column.
We extended the wide fibonacci trace to 2^10 columns.
This is achieved by introducing conditional compilation features to switch between parallel and single threads.
We saw improvements of >70% in the trace interpolation time which translates to an improvement of about 5% in total proving time.
This change is