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>

crates/common/src/traces/constants.rs

@@ -0,0 +1,27 @@
+/// OpenTelemetry semantic convention constants for tracing
+///
+/// These constants ensure consistency across the codebase and prevent typos
+
+/// Resource attribute keys following OTEL semantic conventions
+pub mod resource {
+    /// Logical name of the service
+    pub const SERVICE_NAME: &str = "service.name";
+
+    /// Version of the service
+    pub const SERVICE_VERSION: &str = "service.version";
+
+    /// Service namespace/environment
+    pub const SERVICE_NAMESPACE: &str = "service.namespace";
+
+    /// Service instance ID
+    pub const SERVICE_INSTANCE_ID: &str = "service.instance.id";
+}
+
+/// Instrumentation scope defaults
+pub mod scope {
+    /// Default scope name for tracing instrumentation
+    pub const DEFAULT_NAME: &str = "brightstaff.tracing";
+
+    /// Default scope version
+    pub const DEFAULT_VERSION: &str = "1.0.0";
+}