Add support for GenevaExporter in the host

[gzuber]

Currently, customers can add GenevaExporter to the worker process, but there is no way to configure it on the host. This limitation prevents full observability and consistent configuration across environments.

We need to add the ability to configure GenevaExporter directly on the host through an extension, ensuring customers can manage telemetry in a standardized and supported way.

[Ved2806]

Hi @brettsam Could you please help with this issue?

[brettsam]

Assigning to @RohitRanjanMS to triage. He's likely already tracking.