Intial commit of the new branch feat/monitoring

proto/monitoring.proto

src/monitoring/client/MonitoringClient.py

src/monitoring/requirements.in

src/monitoring/service/AlarmManager.py

src/monitoring/service/ManagementDBTools.py

src/monitoring/service/MetricsDBTools.py

src/monitoring/service/MonitoringService.py

src/monitoring/service/MonitoringServiceServicerImpl.py

src/monitoring/service/SqliteTools.py

src/monitoring/service/SubscriptionManager.py

src/monitoring/tests/Messages.py

src/monitoring/tests/test_unitary.py