Report expired sessions #281
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Description
Users cannot keep track of active sessions as they expire internally in our cache. This PR adds an extra message (breaking the API), that reports when a session has been removed from our internal cache.
This does change the expiry logic also. Previously we were removing elements on most operations, i.e when we send/receive a message. We now only remove old elements when a new session is added, or one fails. So long as there are new connections, we will expire old ones. If the peer set remains consistent without errors, we will no longer expire elements simply based on time. I don't consider this an issue (we can also add this functionality back if anyone is concerned about checking the cache more regularly).