Packs a point on the Baby Jubjub elliptic curve into a bigint.
This process involves converting the y-coordinate to a buffer and conditionally modifying the last byte
to encode the sign of the x-coordinate, following a specific compact representation format.
Packs a point on the Baby Jubjub elliptic curve into a bigint. This process involves converting the y-coordinate to a buffer and conditionally modifying the last byte to encode the sign of the x-coordinate, following a specific compact representation format.