Support Azure Monitor App Insights Metrics Reporting

[eliasbruvik]

The OpenTelemetry library was implemented in #2291 to expose metrics for WITSML requests. It was however only implemented in the witsml-directory to enable capturing the metrics on any application that uses our witsml nuget package. We still need to actually use the metrics in WEx.

I suggest implementing support for passing the metrics to Azure Monitor App Insights through some optional configuration in appsettings.json, similar to how we optionally support Azure Keyvault. Update the documentation accordingly.