feat/ed25519-support

[MasterKale]

This PR adds the ability to indicate support for the Ed25519 (-8) public key credential algorithm during registration:

This algorithm is also enabled by default and is placed first to encourage more authenticators to use it if they support it:

{
  // ...
  "pubKeyCredParams": [
    { "type": "public-key", "alg": -8 },
    { "type": "public-key", "alg": -7 },
    { "type": "public-key", "alg": -257 }
  ],
  // ...
}

I'm also including some refactor to remove the last usage of Pydantic, and also started writing some unit tests to stop being so irresponsible with this website.