feat/webauthn-L3-json-types

[MasterKale]

This PR updates the typescript-types, browser, and server packages with new JSON serialization-related types and functions as defined in L3 of the WebAuthn specification.

The new PublicKeyCredential.parseCreationOptionsFromJSON(), PublicKeyCredential.parseRequestOptionsFromJSON(), and PublicKeyCredential.toJSON() methods have been added to typescript-types, but browser package will not make use of them.

The "simpler" use of SimpleWebAuthn will always be to pair browser with server, if an RP doesn't want to think about it. However, because of the way in which SimpleWebAuthn methods are being updated in this PR, RP's that choose to eschew use of browser for these JSON methods should gradually become able to spin their own front end logic with the official API methods and still use the values and methods from server for options and verification.

Breaking Changes

• The RegistrationCredentialJSON type has been replaced by the RegistrationResponseJSON type
• The AuthenticationCredentialJSON type has been replaced by the AuthenticationResponseJSON type
• RegistrationResponseJSON.transports has been relocated into RegistrationCredentialJSON.response.transports to mirror response structure in the WebAuthn spec
• @simplewebauthn/server's verifyRegistrationResponse() method has had its credential argument renamed to response
• @simplewebauthn/server's verifyAuthenticationResponse() method has had its credential argument renamed to response