Enhancement for TLS certificate relted code

[WillardHu]

What would you like to be added/modified:

• [x] Encapsulate Token operations. https://github.com/kubeedge/kubeedge/pull/5502
• [x] Abstract some methods for certificates, and implement x509 and K8s csr first(implement gmx509 in the future). https://github.com/kubeedge/kubeedge/pull/5544
• [ ] Abstract some methods for PKI(tls.Config), and implement standard TLS(implement GMTLS in the future).
• [ ] Abstract some mehtods for Server, and implement websocket, quic and webservice(implement gmwebsocket, gmquic and gmwebservice in the future).
• [ ] Abstract some methods for HubClient, and implement websocket and quic(implement gmwebsocket and gmquic in the future).
• [ ] Abstract some methods for TunnelClient, and implement webservice(implement gmwebservice in the future).

Why is this needed:

1. We maintain the functions of a business in one place to improve readability and maintainability.
2. We should use a unique CA to sign the server certificate whenever possible.
3. We abstract the certificate, PKI, Server and Client to extend GMTLS in the future(this issue is the pre-task of the #5334).

[WillardHu]

/assign