Update Rust cryptography library for ed25519-dalek V2

[TheNewAutonomy]

Feature Request

Is your feature request related to a problem? Please describe.
The ed25519-dalek library being used is an v1 release candidate and so pre-version 1. This library has been updated to v2 which includes some breaking changes. For optimal performance and for security best practice we should upgrade to v2, changing our code accordingly.

Describe the solution you'd like
Either update the current package to work with ed25519-dalek v2 or write a new package targeting v2.

Describe alternatives you've considered
Sticking with the current build or switching to a .NET version. The Rust implementation will be the most optimal for performance and so we should continue to use this package.

Teachability, Documentation, Adoption, Migration Strategy
Users should not be impacted by the change.