* 2-NAF for MNT pairings

* Apply suggestions from code review

* Apply suggestions from code review

* fix

* no std

* patch

* ci

Co-authored-by: Weikeng Chen <w.k@berkeley.edu>
Co-authored-by: onewayfunc <onewayfunc@gmail.com>

Co-authored-by: Pratyush Mishra <pratyushmishra@berkeley.edu>

Co-authored-by: Sun <huachuang20@gmail.com>
Co-authored-by: Pratyush Mishra <pratyushmishra@berkeley.edu>

Co-authored-by: Nicholas Ward <npward@berkeley.edu>
Co-authored-by: Pratyush Mishra <pratyushmishra@berkeley.edu>
Co-authored-by: Weikeng Chen <w.k@berkeley.edu>
Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
Co-authored-by: Daira Hopwood <daira@jacaranda.org>
Co-authored-by: William Lin <31808623+Will-Lin4@users.noreply.github.com>
Co-authored-by: Dev Ojha <dojha12@gmail.com>
Co-authored-by: Alex Ozdemir <aozdemir@hmc.edu>