Add the stopping degree as a protocol parameter.

[jdodinh]

It would be nice to have an optional protocol parameter defining the stopping degree: the degree at which the protocol stops the folding and sends the polynomial. This would follow the idea from STIR.

[varun-doshi]

Would this optionally replace 1 << folding_factor)?

whir/src/poly_utils/coeffs.rs

Line 250 in 5f6ff22

.par_chunks_exact(1 << folding_factor)

[WizardOfMenlo]

@varun-doshi , no this only effects when to stop the the recursion.
folding_factor is how many variables each recursion step removes, while stopping degree determines at how many variables to send the final polynomial.