Improve GS io tracing for TTIGW & LBS LNS protocols

[vlasebian]

Summary

Improve Gateway Server io tracing for TTIGW and LBS LNS (Semtech WebSocket) protocols by adding OpenTelemetry spans to key connection and message handling operations.

Changes

• Add tracing spans to TTIGW frontend: HandleConnection, HandleUpMessage, HandleDownMessage in pkg/gatewayserver/io/ttigw/ttigw.go.
• Add tracing spans to Semtech WebSocket (LBS LNS) frontend: HandleConnectionInfo, HandleTraffic, HandleUpMessage, HandleDownMessage in pkg/gatewayserver/io/semtechws/ws.go.
• Replace deprecated otrace.NewNoopTracerProvider() with noop.NewTracerProvider() in pkg/telemetry/tracing/tracing.go.

Testing

Steps

1. Start the Gateway Server with tracing enabled.
2. Connect a gateway using the TTIGW or LBS LNS protocol.
3. Send uplink/downlink messages and verify that spans are created and visible in the trace.

Results

Spans should appear for each connection lifecycle and message exchange, with error recording on failures.

Regressions

None.

Notes for Reviewers

None.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Testing: The steps/process to test this feature are clearly explained including testing for regressions.
• Infrastructure: If infrastructural changes (e.g., new RPC, configuration) are needed, a separate issue is created in the infrastructural repositories.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[vlasebian]

I've also improved the recording of the errors in the spans.

One more thing to note, this only improves otel traces, but there is no runtime tracing in here. Should we add runtime tracing too?