feat: auto reconnect [MTT-2617] (#611)

* Implementing auto-reconnect feature to reconnect to a game if losing connection unexpectedly

* Adding popup that needs to be manually closed for reconnect attempts

* Unload all additive scenes when client begins synchronizing

Author: LPLafontaineB

Assets/BossRoom/Prefabs/NetworkingManager.prefab

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     EnableTimeResync: 0

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