Generate registration options

[MasterKale]

This PR fleshes out the GET /registration/options endpoint to support the following options as query params:

• userName (Required): String
• userID (Optional): base64url string of bytes (defaults to random ID generated by SimpleWebAuthn)
• userVerification (Optional): Either 'discouraged', 'preferred', or 'required' (defaults to 'preferred')
• attestation (Optional): Either 'none' or 'direct' (defaults to 'none')
• attachment (Optional): Either 'cross-platform' or 'platform'
• algES256 (Optional): Boolean (defaults to true)
• algRS256 (Optional): Boolean (defaults to true)
• discoverableCredential (Optional): Either 'discouraged', 'preferred', or 'required' (defaults to 'required')

[MasterKale]

Tests are broken because of an issue with module resolution in @cloudflare/vitest-pool-workers. They don't like imports of folders with an index.js file (e.g. errors/index.js) as "./errors". This is currently manifesting as any import of SimpleWebAuthn breaking test execution (the test environment doesn't like the @peculiar libraries in particular.)

See here:

cloudflare/workers-sdk#6286 (comment)

What's annoying is that the code is otherwise fine - it executes as expected when hitting http://localhost:8787/registration/options. It's only the testing environment that's having problems 😞

[MasterKale]

Oh nice upgrading @cloudflare/vitest-pool-workers@0.4.21 fixed the tests 🎉

[MasterKale]

@timcappalli I'm curious what you think about this as a direction for the API to go. I basically modeled it after what's on https://webauthn.io. There's still some things missing (sessions to store challenges for, persistence of challenges, etc...) but I want to make sure this is good so far before I merge it and move on.

[timcappalli]

Suggested change

	userName,
	userName: username,

This threw me being case sensitive and wasn't expecting a capital N