chore: add license

Author: hoolioh

libdd-data-pipeline/src/telemetry/worker.rs

@@ -1,3 +1,6 @@
+// Copyright 2026-Present Datadog, Inc. https://www.datadoghq.com/
+// SPDX-License-Identifier: Apache-2.0
+
 #[cfg(feature = "telemetry")]
 pub(crate) use libdd_telemetry::worker::TelemetryWorker;