* implementation of the fast subgroup check for bls12_381
* add a bench
* subgroup check for g1
* subgroup check modifications
* remove useless test
* fmt
* need the last version of arkworks/algebra
* remove Parameters0
* using projective points is more efficient
* use of projective coordinates in G2
* fmt
* documentation on the constants and the psi function
* references for algorithms of eprint 2021/1130
* fmt
* sed ^ **
* minor improvement
* fmt
* fix Cargo toml
* nits
* some cleanup for g1
* add the beta test back
* fmt
* g2
* changelog
* add a note on the Cargo.toml
* nits
* avoid variable name conflicts
* add the early-out optimization
Co-authored-by: weikeng <w.k@berkeley.edu>
