Migrate to a pure Rust implementation for Falcon DSA

[Al-Kindi-0]

It seems that it would be beneficial for Miden wallet to migrate to a pure Rust implementation of Falcon DSA. Since we have a good portion of the code already in Rust, the task would then be to:

### Tasks
- [x] Implement key generation algorithm.
- [x] Implement the signing algorithm.
- [x] Make the DSA generic over the hash-to-point algorithm.

[bobbinth]

Thank you! I would probably tackle the last two points first (i.e., signing algorithm and making the DSA generic over the hashing function), and would tackle the key generation in separate PR.

[bobbinth]

Closed by #285.