Improve end to end tracing (#628)

* adding canonical tracing support via bright-staff

* improved formatting for tools in the traces

* removing anthropic from the currency exchange demo

* using Envoy to transport traces, not calling OTEL directly

* moving otel collcetor cluster outside tracing if/else

* minor fixes to not write to the OTEL collector if tracing is disabled

* fixed PR comments and added more trace attributes

* more fixes based on PR comments

* more clean up based on PR comments

---------

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-342.local>

demos/samples_python/currency_exchange/arch_config.yaml

@@ -8,8 +8,15 @@ listeners:
     timeout: 30s
 
 llm_providers:
-  - access_key: $OPENAI_API_KEY
-    model: openai/gpt-4o
+  - model: openai/gpt-4o-mini
+    access_key: $OPENAI_API_KEY
+    default: true
+
+  - model: openai/gpt-4o
+    access_key: $OPENAI_API_KEY
+    routing_preferences:
+      - name: code understanding
+        description: understand and explain existing code snippets, functions, or libraries
 
 endpoints:
   frankfurther_api: