[chore] update otel libraries (#3740)

* chore: update otel dependencies

* refactor: combine tracing & metrics in observability package

* chore: update example tracing compose file

vendor/go.opentelemetry.io/auto/sdk/tracer_provider.go

@@ -0,0 +1,33 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package sdk
+
+import (
+	"go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace/noop"
+)
+
+// TracerProvider returns an auto-instrumentable [trace.TracerProvider].
+//
+// If an [go.opentelemetry.io/auto.Instrumentation] is configured to instrument
+// the process using the returned TracerProvider, all of the telemetry it
+// produces will be processed and handled by that Instrumentation. By default,
+// if no Instrumentation instruments the TracerProvider it will not generate
+// any trace telemetry.
+func TracerProvider() trace.TracerProvider { return tracerProviderInstance }
+
+var tracerProviderInstance = new(tracerProvider)
+
+type tracerProvider struct{ noop.TracerProvider }
+
+var _ trace.TracerProvider = tracerProvider{}
+
+func (p tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.Tracer {
+	cfg := trace.NewTracerConfig(opts...)
+	return tracer{
+		name:      name,
+		version:   cfg.InstrumentationVersion(),
+		schemaURL: cfg.SchemaURL(),
+	}
+}