Revise OAuth session and token identifier claims sid, psid, jti etc.

[byewokko]

Some custom Seacat claims clash with officially registered claims (https://www.iana.org/assignments/jwt/jwt.xhtml).

Current state in Seacat Auth

• psid claim contains "root" session ID
• sid claim contains "client" Session ID
• jti claim is not used

Proposal

• sid is registered as "Session ID" for the purpose of SSO login and logout. In Seacat Auth this should correspond to the "root" session ID.
• jti is registered as "JWToken ID" for the purpose of revoking the token, checking its uniqueness etc. This would have to be implemented.
• Introduce custom claim csid (Client Session ID) to refer to the seacat client session id.