API for touching remote sessions and tagging sessions with account
- introduce touch() method for updating last activity timestamp of remote sessions
- put information about account(s) related to a session so that information can be retrieved without actually unserializing the object graph (resuming the session)
[FEATURE] Touch remote sessions and tag with account info
This introduces two new features: updating the last activity timestamp
of a remote session through a new method "touch()" and tagging sessions
with their respective account (if any).