Add export to Jeager

[bugRanger]

We need to implement export in Jeager, but we shouldn't use the HttpClient code, as constantly generating requests/responses as objects results in the same GC load as Activity. It's worth looking at something simpler and more optimal, for example, https://github.com/chronoxor/NetCoreServer

ToDo

• Perform memory/speed benchmarks between System.Net.Http vs NetCoreServer.HttpClient.
• Add an implementation for export to Jaeger.