Using larger lookup tables

[PanosChtz]

I see that #350 added the option to use larger lookup tables, however I don't see a way to do it. What I understand from here is that the default lookup table has size 8, but the constants in https://github.com/dalek-cryptography/curve25519-dalek/blob/main/src/backend/serial/u64/constants.rs only have lookup tables for size 8. Is there some way to generate the larger lookup tables ourselves?

[yokomizor]

use curve25519_dalek::traits::BasepointTable;
use curve25519_dalek::edwards::*;
EdwardsBasepointTableRadix16::create(&point);
EdwardsBasepointTableRadix32::create(&point);
EdwardsBasepointTableRadix64::create(&point);
EdwardsBasepointTableRadix128::create(&point);
EdwardsBasepointTableRadix256::create(&point);