EventSource Telemetry Integration

One of the default metrics sources we want to support for https://github.com/getsentry/sentry-dotnet/issues/3020 is EventSource based metrics.

See the Microsoft DevBlog on [.NET 5 Networking Improvements to Telemetry](https://devblogs.microsoft.com/dotnet/net-5-new-networking-improvements/#telemetry) and also the [Well Known Counters](https://learn.microsoft.com/en-us/dotnet/core/diagnostics/available-counters) that we could capture out of the box.