CM - Application Insights - Implement tracking custom events and metrics

[mathieu-benoit]

https://docs.microsoft.com/en-us/azure/application-insights/app-insights-api-custom-events-metrics

• TrackDependency (in C# to track performance around the add() method): https://docs.microsoft.com/en-us/azure/application-insights/app-insights-api-custom-events-metrics#trackdependency
• TrackEvent (in javascript to track button click): https://docs.microsoft.com/en-us/azure/application-insights/app-insights-api-custom-events-metrics#trackevent