Add restart functionality to services

[koke1997]

Add restart functionality to various services and update related tests.

• Centralized Server: Add restartServer function and update startServer to handle restarts in centralized_server.scala. Add test case for restartServer in test_centralized_server.scala.
• Fault Tolerance: Add restart function and update start to handle restarts in fault_tolerance.scala. Add test case for restart in test_fault_tolerance.scala.
• Peer Discovery: Add restart function and update start to handle restarts in peer_discovery.scala. Add test case for restart in test_peer_discovery.scala.
• Reliable Transmission: Add restart function and update sendData to handle restarts in reliable_transmission.scala. Add test case for restart in test_reliable_transmission.scala.
• Scala Connector: Add restart function and update sendToErlang to handle restarts in scala_connector.scala. Add test case for restart in test_scala_connector.scala.
• Video Chunking: Add restart function and update chunkVideo to handle restarts in video_chunking.scala. Add test case for restart in test_video_chunking.scala.
• Monitoring Script: Add restart_services function and update handle_error to call restart_services in monitor.sh.
• Run Local Script: Add --restart argument and update run_app to handle the argument in run_local.py.

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