feat: expose live_session_resumption_update in events for cross-connection resumption #4358

AshleyMaloney wants to merge 3 commits intogoogle:maingoogle/adk-python:mainfrom

AshleyMaloney:fix/expose-live-session-resumption-updateAshleyMaloney/adk-python:fix/expose-live-session-resumption-updateCopy head branch name to clipboard