Review Servlet spec on session semantics in distributed environments

[vpavic]

We should probably review Servlet spec on session semantics in distributed environments and see whether Spring Session needs some alignment there. This especially goes for session events, where Spring Session behavior ATM is to publish events to all nodes in the cluster.

Relevant Servlet spec sections:

• https://jakarta.ee/specifications/servlet/5.0/jakarta-servlet-spec-5.0.html#distributed-environments
• https://jakarta.ee/specifications/servlet/5.0/jakarta-servlet-spec-5.0.html#distributed-containers