PSA_ECC_FAMILY_TWISTED_EDWARDS macro

The twisted Edwards curves Ed25519 and Ed448. These curves are suitable for EdDSA (#PSA_ALG_PURE_EDDSA for both curves, #PSA_ALG_ED25519PH for the 255-bit curve, #PSA_ALG_ED448PH for the 448-bit curve). This family comprises the following twisted Edwards curves: - 255-bit: Edwards25519, the twisted Edwards curve birationally equivalent to Curve25519. Bernstein et al., _Twisted Edwards curves_, Africacrypt 2008. - 448-bit: Edwards448, the twisted Edwards curve birationally equivalent to Curve448. Hamburg, _Ed448-Goldilocks, a new elliptic curve_, NIST ECC Workshop, 2015.