Re: [webauthn] Provide request deserialization, response serialization (#1683)

I've implemented @MasterKale's API from #1703 in https://github.com/github/webauthn-json as `v2.0.0-alpha1`.

```typescript
// @github/webauthn-json/browser-ponyfill

function supported(): boolean;

function parseCreationOptionsFromJSON(json: JSON): CredentialCreationOptions;
function parseRequestOptionsFromJSON(json: JSON): CredentialRequestOptions;

// You can call `.toJSON()` on the result.
function create(
  options: CredentialCreationOptions,
): Promise<PublicKeyCredential>;
// You can call `.toJSON()` on the result.
function get(options: CredentialRequestOptions): Promise<PublicKeyCredential>;
```

This ended up fairly simple thanks to @MasterKale's efforts, but I'd love to see if this also works for people in the wild, in case that can help shake out any issues before browsers implement the API.

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