[WIP][FEATURE] Classic session storage service

* !!! known bug: T3_SERVICES prohibits multiple instances of services so sessions in frontend are broken because FE and BE sessions are used in same request
* implementation of SessionStorageInterface based on traditional code from class AbstractUserAuthentication
* duplicated code could be removed from AbstractUserAuthentication later

Change-Id: Idad0fd2b3368a4c7ef5f163264becb1c9783c2b6
Resolves: #51731
Releases: 6.2