KZG does not need FFT

[ThomasPiellard]

In KZG the quotient polynomial (f-z)/(X-z) si computed "by hand" without FFT, so the fft domain should be removed from the API.
(ex Open(p polynomial.Polynomial, point *fr.Element, domain *fft.Domain, srs *SRS)-->Open(p polynomial.Polynomial, point *fr.Element , srs *SRS) ).

This change will affect the plonk code in gnark.