[ekjotmultani]

Session starts and stops are now sent to the sink as _session.start and _session.stop events. The stop event carries stop_timestamp and duration, which were computed before but never sent.

• Every send goes through one ordered queue, so the sink receives events in call order and nothing after the final stop from close(). close() no longer drops sends that are still queued.
• Resuming after an explicit stopSession() no longer starts a new session, a second stopSession() no longer changes the stop time, a stale timeout no longer stops a resumed session, and session calls do nothing after close().
• A session that starts while the app is in the background is paused right away, so it still times out.
• New options: emitSessionEvents (default true) to turn the session events off, and initialUserId, initialGlobalAttributes and initialGlobalMetrics so the launch _session.start can carry them.

Related: aws-amplify/amplify-swift#4180

[codecov]

Codecov Report

❌ Patch coverage is 96.11650% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.77%. Comparing base (f3370de) to head (485a6fd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3496      +/-   ##
==========================================
+ Coverage   57.65%   57.77%   +0.12%     
==========================================
  Files        1128     1129       +1     
  Lines       33198    33268      +70     
  Branches     4949     4961      +12     
==========================================
+ Hits        19140    19221      +81     
+ Misses      12130    12120      -10     
+ Partials     1928     1927       -1     

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