Consider adding support for multiple sessions for a single user

[vpavic]

As a part of simplifications of integration with the Servlet APIs that was done in #906, the existing support for multiple sessions for a single user was removed. We should consider re-introducing this feature based on the new API while also taking into account the reactive support.

[dzj2046]

+1

[smorandi]

+1

[gmedici]

+1

[rwinch]

For those doing a +1 on the issue, please ensure you do a reaction of to the original description as this ensures we have a tally of those interested.

[nguyentienlinh2611]

+1

[mattluce]

Any plans to add this back into the library?

[TalSheffer]

Much needed, +1

[ypenn21]

please add this back! +1000

[supernovachoi]

+1

[Paddy-Farmeye]

@rwinch, I see you've removed this issue from the General Backlog. I assume that means the google-like multi-session functionality is not possibly with Spring Session and won't be implemented going forward? If this is the case, are you aware of any side projects which integrate to fill the functionality gap?