Similar to Keruald GitHub, could we have a Keruald Tokens to validate security tokens like Yubico keys?

A first need for Zed is to replace YubiCloud authentication, as Auth_Yubico PHP class is deprecated and points to non existing anymore endpoints.

Plan:

• create a new component in rKERUALD for security tokens and publish it under keruald/tokens
• implement OTP validation protocol in a Yubico\OTP class
• verify signature, with code as described in the protocol (keruald/github XHubSignature verification code can be helpful there)

Reference: https://developers.yubico.com/OTP/Specifications/OTP_validation_protocol.html