feat(telemetry): instrument inference duration and frame age

vendor/go.opentelemetry.io/otel/.gitignore

@@ -0,0 +1,21 @@
+.DS_Store
+Thumbs.db
+
+.tools/
+.idea/
+.vscode/
+*.iml
+*.so
+coverage.*
+
+gen/
+
+/example/fib/fib
+/example/jaeger/jaeger
+/example/namedtracer/namedtracer
+/example/opencensus/opencensus
+/example/passthrough/passthrough
+/example/prometheus/prometheus
+/example/prom-collector/prom-collector
+/example/zipkin/zipkin
+/example/otel-collector/otel-collector