add Lpn estimator

[xiangxiecrypto]

This PR contains:

1. A security estimator for LPN in binary field.
2. A security estimator for Dual LPN in binary field.
   More work still need to do to implement a "smart" way to choose the "best" parameters according to the number of COTs needed when using Ferret. This will be done later.

[sinui0]

@xiangxiecrypto can we convert this into something like:

/// Selects suitable parameters with a minimum security level of 128 bits.
///
/// # Arguments
/// * `ty` - LPN type.
/// * `k` - Length of the secret vector.
/// * `t` - Hamming weight of the error vector.
fn select_params(ty: LpnType, k: usize, t: usize) -> LpnParameters {}

The implementation can be a simple static look up table, or approximate it with a linear regression. Instead of including this in the mpz-core library we can convert it into a binary which computes this

[themighty1]

Closing, superceded by #218