Make WebAuthnAuthenticationTokenRequest Serializable

[jzheaux]

WebAuthAuthenticationTokenRequest should be serializable. It isn't, however, since some of its components aren't serializable. Either they should also be serializable or marked as transient.

[franticticktick]

Hi @jzheaux, could you assign this ticket to me please?

[jzheaux]

Sure thing, @franticticktick. Will you please add it on the 6.4.x branch, please?

[franticticktick]

@jzheaux there seems to be some confusion here. WebAuthnAuthenticationRequestToken contains RelyingPartyAuthenticationRequest, and it already contains PublicKeyCredentialRequestOptions.
This issue should be solved here, and I see that this ticket is still in progress. Besides, it was not introduced as a bug, which means the changes will be merged into main. Therefore, we need to decide which branch to add these changes to.